ZookeeperServiceDiscovery curator client support multi address.

[horizonzy]

What is the purpose of the change

ZookeeperServiceDiscovery curator client support multi address.

dubbo/dubbo-remoting/dubbo-remoting-zookeeper/src/main/java/org/apache/dubbo/remoting/zookeeper/curator/CuratorZookeeperClient.java

Lines 65 to 71 in b62832b

	int timeout = url.getParameter(TIMEOUT_KEY, DEFAULT_CONNECTION_TIMEOUT_MS);
	int sessionExpireMs = url.getParameter(ZK_SESSION_EXPIRE_KEY, DEFAULT_SESSION_TIMEOUT_MS);
	CuratorFrameworkFactory.Builder builder = CuratorFrameworkFactory.builder()
	.connectString(url.getBackupAddress())
	.retryPolicy(new RetryNTimes(1, 1000))
	.connectionTimeoutMs(timeout)
	.sessionTimeoutMs(sessionExpireMs);

See line_68

[codecov-io]

Codecov Report

Merging #7285 (7abcc17) into master (eef6b45) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #7285      +/-   ##
============================================
- Coverage     59.06%   59.00%   -0.07%     
+ Complexity      462      461       -1     
============================================
  Files          1044     1044              
  Lines         42480    42480              
  Branches       6229     6229              
============================================
- Hits          25090    25064      -26     
- Misses        14591    14609      +18     
- Partials       2799     2807       +8     

Impacted Files	Coverage Δ	Complexity Δ
...registry/zookeeper/util/CuratorFrameworkUtils.java	93.02% <100.00%> (ø)	0.00 <0.00> (ø)
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	81.13% <0.00%> (-11.33%)	0.00% <0.00%> (ø%)
...e/dubbo/remoting/transport/netty/NettyChannel.java	55.68% <0.00%> (-4.55%)	20.00% <0.00%> (-1.00%)
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0.00%> (-4.35%)	0.00% <0.00%> (ø%)
...pache/dubbo/remoting/transport/AbstractServer.java	53.75% <0.00%> (-3.75%)	0.00% <0.00%> (ø%)
...he/dubbo/rpc/protocol/hessian/HessianProtocol.java	67.46% <0.00%> (-2.41%)	9.00% <0.00%> (ø%)
...he/dubbo/registry/multicast/MulticastRegistry.java	67.12% <0.00%> (-0.93%)	0.00% <0.00%> (ø%)
...dubbo/remoting/exchange/support/DefaultFuture.java	87.17% <0.00%> (-0.86%)	0.00% <0.00%> (ø%)
...org/apache/dubbo/registry/redis/RedisRegistry.java	49.21% <0.00%> (-0.79%)	28.00% <0.00%> (ø%)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	60.00% <0.00%> (-0.59%)	31.00% <0.00%> (ø%)
... and 3 more

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