Dubbo cloud native (#5291)

* Polish #4542 : [Enhancement] Adapt the Java standard Event/Listener mechanism

* Polish #4541 : [Feature] Add local File System DynamicConfigurationFactory‘s extension

* Polish #4541 : Bugfix

* Polish #4541 : Optimization

* Polish #4541 : Add the compatibility for PollingWatchService on the some platforms

* Polish #4541 : Add delay publish without ThreadPoolExecutor

* Polish #4541 : Refactor the extension name

* Polish #4541 : Add remove ops

* Polish #4541 : Add testable constructor

* Polish #4541 : Add getConfigGroups method

* Polish #4610 : [Refactor] Refactor the bootstrap module

* Polish #4541 : Fix the nulling URL issue

* Polish #4622 : [Refactor] Refactor ConfigManager

* Polish #4622 : [Refactor] Refactor ConfigManager

* Polish #4622 : Support multiple configcenters

* Polish #4671 : ServiceNameMapping will not map the group, version and protocol

* update referenceCount log (#4683)

Add comments to support multiple shared connections

* Polish /#4687 : Remove the duplicated test code in dubbo-config-spring (#4688)

* #4685  修改代码if判断false问题 if (hasException == false)修改成if (!hasException) (#4695)

* Fixed Service annotation method parameters are not in effect (#4598)

* keep demo simple, and switch to use zookeeper as registry center (#4705)

* keep demo simple, and switch to use zookeeper as registry center

* remove comment

* @reference auto-wires the instance of generic interface #4594 (#4677)

* try to shorten maven output to make travis build pass (#4710)

* use CountDownLatch to check zk registry if establish connection (#4589)

* Minor change

* Rename the extension name of WritableMetadataService

* Polish #4759 : [Refactor] Change the signature of methods of MetadataService #4759

* Merge remote-tracking branch 'upstream/master' into dubbo-cloud-native

# Conflicts:
#	dubbo-all/pom.xml
#	dubbo-bom/pom.xml
#	dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/AbstractInterfaceConfig.java
#	dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ApplicationConfig.java
#	dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ConfigCenterConfig.java
#	dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ReferenceConfig.java
#	dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/RegistryConfig.java
#	dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ServiceConfig.java
#	dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/ReferenceConfigTest.java
#	dubbo-configcenter/dubbo-configcenter-api/src/main/java/org/apache/dubbo/configcenter/DynamicConfiguration.java
#	dubbo-configcenter/dubbo-configcenter-api/src/test/java/org/apache/dubbo/configcenter/mock/MockDynamicConfiguration.java
#	dubbo-configcenter/dubbo-configcenter-consul/src/main/java/org/apache/dubbo/configcenter/consul/ConsulDynamicConfiguration.java
#	dubbo-configcenter/dubbo-configcenter-etcd/src/test/java/org/apache/dubbo/configcenter/support/etcd/EtcdDynamicConfigurationTest.java
#	dubbo-configcenter/dubbo-configcenter-nacos/src/main/java/org/apache/dubbo/configcenter/support/nacos/NacosDynamicConfiguration.java
#	dubbo-configcenter/dubbo-configcenter-nacos/src/test/java/org/apache/dubbo/configcenter/support/nacos/NacosDynamicConfigurationTest.java
#	dubbo-configcenter/dubbo-configcenter-zookeeper/src/main/java/org/apache/dubbo/configcenter/support/zookeeper/ZookeeperDynamicConfiguration.java
#	dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/definition/model/MethodDefinition.java
#	dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/report/identifier/MetadataIdentifier.java
#	dubbo-metadata/dubbo-metadata-api/src/main/java/org/apache/dubbo/metadata/report/support/AbstractMetadataReport.java
#	dubbo-metadata/dubbo-metadata-api/src/test/java/org/apache/dubbo/metadata/report/identifier/MetadataIdentifierTest.java
#	dubbo-metadata/dubbo-metadata-definition-protobuf/src/main/java/org/apache/dubbo/metadata/definition/protobuf/ProtobufTypeBuilder.java
#	dubbo-metadata/dubbo-metadata-definition-protobuf/src/test/java/org/apache/dubbo/metadata/definition/protobuf/ProtobufTypeBuilderTest.java
#	dubbo-metadata/pom.xml
#	dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/integration/AbstractConfiguratorListener.java
#	dubbo-registry/dubbo-registry-nacos/src/main/java/org/apache/dubbo/registry/nacos/NacosRegistry.java
#	dubbo-registry/dubbo-registry-nacos/src/main/java/org/apache/dubbo/registry/nacos/NacosRegistryFactory.java
#	dubbo-rpc/dubbo-rpc-xml/src/main/java/org/apache/dubbo/xml/rpc/protocol/xmlrpc/XmlRpcProtocol.java

* Polish #3984 : Add the implementation of Page<ServiceInstance> getInstances(String serviceName, int offset, int pageSize, boolean healthyOnly)

* Code merge

* Fix the cases

* Merge remote-tracking branch 'upstream/cloud-native' into dubbo-cloud-native

# Conflicts:
#	dubbo-bootstrap/src/test/java/org/apache/dubbo/bootstrap/DubboServiceProviderBootstrap.java
#	dubbo-metadata/dubbo-metadata-definition-protobuf/pom.xml
#	dubbo-registry/dubbo-registry-api/src/test/java/org/apache/dubbo/registry/support/ServiceOrientedRegistryTest.java
#	dubbo-registry/dubbo-registry-consul/src/main/java/org/apache/dubbo/registry/consul/ConsulServiceDiscoveryFactory.java
#	dubbo-registry/dubbo-registry-etcd3/src/main/java/org/apache/dubbo/registry/etcd/EtcdServiceDiscovery.java

* Refactor ConfigManager

* Refactor ConfigManager

* Resolve the issues on ConfigManager

* Refactor and add test-cases for ConfigManager

* Polish #4774 : [Feature] Dubbo Cloud Native - To Support in Spring

* Polish #4808 : [Feature] Add the registered/unregistered event mechanism ShutdownHook

* Polish #4807 : [Feature] Add the callback mechanism ShutdownHook #4807

* Polish #4813 : [Feature] add Prioritized implementation for ServiceInstanceCustomizer

* Polish #4815 : [Feature] Add the ServiceLoader for Dubbo's services or components

* Polish #4815 : [Feature] Add the ServiceLoader for Dubbo's services or components

* Polish #4813 : [Feature] add Prioritized implementation for ServiceInstanceCustomizer

* Polish #4807 : Add sort implementation

* Refactor

* Refactor

* Polish #4845 : [Feature] Enhance the Event-Publishing feature to original ServiceDiscovery

* Merge remote-tracking branch 'upstream/cloud-native' into dubbo-cloud-native

# Conflicts:
#	dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/DefaultServiceDiscoveryFactory.java
#	dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/ServiceDiscoveryRegistry.java

* Merge remote-tracking branch 'upstream/cloud-native' into dubbo-cloud-native

# Conflicts:
#	dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/DefaultServiceDiscoveryFactory.java
#	dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/ServiceDiscoveryRegistry.java

* Polish #4854 : [Feature] MetadataService supports the Dubbo protocol under auto-increased port

* Polish #4857 : [Enhancement] Sync the Metadata storage type into ApplicationConfig

* Polish #4868 : [Enhancement] Refactor ConfigChangeEvent

* Polish #4868 : [Enhancement] Refactor ConfigChangeEvent

* Polish #4873 : [Feature] Add a conditional EventListener into Event Module

* Polish #4875 : [Feature] Refactor ServiceInstancesChangedListener

* Remove the cycle dependencies

* Remove the cycle dependencies

* Polish #4903 : [Feature] Set source into the BeanDefinition of Dubbo Config

* Polish #4902 : [Feature] Dubbo Cloud Native to Spring XML scenario

* Polish #4713 : Initial the new module and dependencies

* Polish #4690 : AnnotatedBeanDefinitionRegistryUtils#registerBeans can't remove the duplicated bean definitions

* Polish #4690 : AnnotatedBeanDefinitionRegistryUtils#registerBeans can't remove the duplicated bean definitions

* Polish #4690 : AnnotatedBeanDefinitionRegistryUtils#registerBeans can't remove the duplicated bean definitions

* Polish #4910 : [Feature] To suppoort DubboLifecycleComponentApplicationListener in Spring XML scenario

* Polish #4713 : Add Service discovery implementation for Eureka #4713

* Polish #4713 : Add Service registration and discovery implementation for Eureka

* Polish #4713 : Add Service registration and discovery implementation for Eureka

* Polish #4920 : [Refactor] Extract the common implementation for URLs' revision

* Refactor

* Polish #4925 : ServiceDiscovery limits only one ServiceInstancesChangedListener each service

* Polish #4925 : ServiceDiscovery limits only one ServiceInstancesChangedListener each service

* Remove useless classes

* Bugfix & Refactor ServiceDiscoveryRegistry

* Polish #4937 : The calculation of Revision should add the parameters of URL

* Polish #4940 : NacosDynamicConfiguration supports getConfigKeys method

* Polish #4942 : Dubbo Cloud Native supports multiple protcols

* Polish #4944 : [Feature] Simplify The metadata of URL for MetadataService

* Polish #4947 : [Feature] Dubbo Cloud-Native supports the REST call to Non-Dubbo

* Merge remote-tracking branch 'upstream/cloud-native' into dubbo-cloud-native

# Conflicts:
#	dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/metadata/ServiceInstanceMetadataUtils.java

* Refactor

* Update JavaDoc

* Polish #4905 : Add test cases for Configuration

* Polish #4905 : Add test cases for AbstractDynamicConfigurationFactory

* Polish #4905 : Add test cases for ConfigChangeType

* Polish #4905 : Add test cases for AbstractDynamicConfiguration

* Polish #4905 : Add test cases for ConfigChangedEvent

* Polish #4905 : Add test cases for ConfigChangedEvent

* Polish #4905 : Add test cases for FileSystemDynamicConfiguration

* Polish #4905 : Add test cases for FileSystemDynamicConfigurationFactory

* Polish #4905 : Enhancement the robustness for FileSystemDynamicConfiguration

* Polish #4905 : Add test cases for AdaptiveClassCodeGenerator

* Polish #4905 : Add test cases for ExtensionLoader

* Polish #4905 : Add test cases for ThrowableAction, ThrowableConsumer, ThrowableFunction

* Polish #4905 : Add test cases for Prioritized

* Polish #4905 : Add test cases for ShutdownHookCallbacks

* Polish #4905 : Add test cases for DubboServiceLoader

* Polish #4981 : Add dubbo-common

* Polish #4907 : Add test cases for DubboServiceDestroyedEvent

* Polish #4907 : Add test cases for DubboShutdownHookRegisteredEvent

* Polish #4907 : Add test cases for DubboShutdownHookUnregisteredEvent

* Polish #4907 : Add test cases for ReferenceConfigDestroyedEvent

* Polish #4907 : Add test cases for ReferenceConfigInitializedEvent

* Polish #4907 : Add test cases for ServiceInstancePortCustomizer

* Polish #4907 : Add test cases for ConfigurableMetadataServiceExporter

* Polish #4907 : bugfix for @EnableDubbo

* Polish #4907 : add test cases for @EnableDubboLifecycle

* Update the version to be 2.7.5

* Polish #5034 : update

* Polish #5034 : Add TypeDefinition builders

* Polish #5034 : Complete TypeDefinition builders

* Polish #5034 : Add ModelUtils

* Polish #5034 : Refactor

* Polish #5034 : Refactor

* Polish #5034 : Refactor

* Polish #5034 : Refactor

* Polish #5034 : Refactor

* Polish #5034 : Refactor

* Polish #5034 : Refactor

* Polish #5034 : Refactor

* Polish #5034 : Refactor

* Polish #5034 : Add Spring Web MVC

* Polish #5034 : Refactor

* Polish #5034 : bug fix

* Polish #5034 : Add test cases

* Polish #5034 : Add test cases