Fix 2.7 multi registry

[chickenlj]

see #9786

[codecov-commenter]

Codecov Report

Merging #9787 (a3ac990) into master (6fe17e7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #9787   +/-   ##
=========================================
  Coverage     60.88%   60.88%           
- Complexity      447      449    +2     
=========================================
  Files          1100     1100           
  Lines         44546    44560   +14     
  Branches       6481     6487    +6     
=========================================
+ Hits          27120    27132   +12     
- Misses        14455    14463    +8     
+ Partials       2971     2965    -6     

Impacted Files	Coverage Δ
...o/rpc/cluster/loadbalance/AbstractLoadBalance.java	70.83% <100.00%> (+2.65%)	⬆️
...ache/dubbo/qos/command/util/ServiceCheckUtils.java	6.89% <0.00%> (-4.87%)	⬇️
...etadata/report/support/AbstractMetadataReport.java	56.31% <0.00%> (-3.40%)	⬇️
...ubbo/registry/support/AbstractRegistryFactory.java	80.28% <0.00%> (-2.82%)	⬇️
...che/dubbo/remoting/transport/mina/MinaChannel.java	46.05% <0.00%> (-1.32%)	⬇️
...ting/zookeeper/curator/CuratorZookeeperClient.java	67.79% <0.00%> (-1.13%)	⬇️
...bbo/rpc/cluster/support/ForkingClusterInvoker.java	85.71% <0.00%> (-0.40%)	⬇️
.../apache/dubbo/config/bootstrap/DubboBootstrap.java	55.09% <0.00%> (+0.06%)	⬆️
...apache/dubbo/common/extension/ExtensionLoader.java	80.41% <0.00%> (+0.41%)	⬆️
.../org/apache/dubbo/config/MetadataReportConfig.java	81.92% <0.00%> (+2.40%)	⬆️
... and 5 more

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