Dubbo zookeeper registry failed to re-subscribe

[xiaoheng1]

What is the purpose of the change

Dubbo zookeeper registry failed to re-subscribe

see more detail from #7665

Brief changelog

Verifying this change

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Format the pull request title like [Dubbo-XXX] Fix UnknownException when host config not exist #XXX. Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Run mvn clean install -DskipTests=false & mvn clean test-compile failsafe:integration-test to make sure unit-test and integration-test pass.
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[codecov-commenter]

Codecov Report

Merging #7669 (29a3808) into master (ed1d357) will decrease coverage by 0.00%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##             master    #7669      +/-   ##
============================================
- Coverage     59.18%   59.17%   -0.01%     
  Complexity      529      529              
============================================
  Files          1076     1076              
  Lines         43458    43417      -41     
  Branches       6353     6320      -33     
============================================
- Hits          25721    25694      -27     
+ Misses        14896    14884      -12     
+ Partials       2841     2839       -2     

Impacted Files	Coverage Δ	Complexity Δ
...he/dubbo/registry/zookeeper/ZookeeperRegistry.java	60.36% <0.00%> (-0.38%)	0.00 <0.00> (ø)
...pache/dubbo/registry/support/FailbackRegistry.java	65.89% <100.00%> (-1.40%)	0.00 <0.00> (ø)
...mmon/threadpool/support/fixed/FixedThreadPool.java	80.00% <0.00%> (-7.50%)	0.00% <0.00%> (ø%)
...moting/transport/netty4/NettyEventLoopFactory.java	30.00% <0.00%> (-6.37%)	0.00% <0.00%> (ø%)
.../threadpool/support/limited/LimitedThreadPool.java	83.33% <0.00%> (-5.56%)	0.00% <0.00%> (ø%)
...apache/dubbo/registry/retry/AbstractRetryTask.java	47.22% <0.00%> (-5.56%)	0.00% <0.00%> (ø%)
...on/threadpool/support/cached/CachedThreadPool.java	85.71% <0.00%> (-4.29%)	0.00% <0.00%> (ø%)
...c/main/java/org/apache/dubbo/rpc/RpcException.java	80.00% <0.00%> (-3.34%)	0.00% <0.00%> (ø%)
...dubbo/remoting/exchange/support/DefaultFuture.java	84.07% <0.00%> (-3.11%)	0.00% <0.00%> (ø%)
.../org/apache/dubbo/qos/legacy/LogTelnetHandler.java	30.30% <0.00%> (-3.04%)	0.00% <0.00%> (ø%)
... and 28 more

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