fix (osgi): Remove ExtensionAdapter reference from ManagedKubernetesC…

…lient

Remove ExtensionAdapter reference from ManagedKubernetesClient, no
provider is exposed for ExtensionAdapter interface in
kubernetes-client module. bindExtensionAdapter and
unbindExtensionAdapter are throwing NullPointerException during
startup.

kubernetes-client/src/main/java/io/fabric8/kubernetes/client/osgi/ManagedKubernetesClient.java

@@ -21,7 +21,6 @@
 import io.fabric8.kubernetes.client.NamespacedKubernetesClient;
 import io.fabric8.kubernetes.client.OAuthTokenProvider;
 import io.fabric8.kubernetes.client.ResourceHandler;
-import io.fabric8.kubernetes.client.extension.ExtensionAdapter;
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.ConfigurationPolicy;
@@ -66,7 +65,6 @@
 @Service({ KubernetesClient.class, NamespacedKubernetesClient.class })
 @References({
     @Reference(referenceInterface = io.fabric8.kubernetes.client.ResourceHandler.class, cardinality = ReferenceCardinality.OPTIONAL_MULTIPLE, policy = ReferencePolicy.DYNAMIC, bind = "bindResourceHandler", unbind = "unbindResourceHandler"),
-    @Reference(referenceInterface = ExtensionAdapter.class, cardinality = ReferenceCardinality.OPTIONAL_MULTIPLE, policy = ReferencePolicy.DYNAMIC, bind = "bindExtensionAdapter", unbind = "unbindExtensionAdapter"),
     @Reference(referenceInterface = OAuthTokenProvider.class, cardinality = ReferenceCardinality.OPTIONAL_UNARY, policyOption = ReferencePolicyOption.GREEDY, bind = "bindOAuthTokenProvider", unbind = "unbindOAuthTokenProvider")
 })
 public class ManagedKubernetesClient extends NamespacedKubernetesClientAdapter<DefaultKubernetesClient> {
@@ -191,14 +189,6 @@ public void unbindResourceHandler(ResourceHandler resourceHandler) {
     // not used
   }
 
-  public void bindExtensionAdapter(ExtensionAdapter adapter) {
-    getClient().getAdapters().register(adapter);
-  }
-
-  public void unbindExtensionAdapter(ExtensionAdapter adapter) {
-    getClient().getAdapters().unregister(adapter);
-  }
-
   public void bindOAuthTokenProvider(OAuthTokenProvider provider) {
     this.provider = provider;
   }