Fix ZookeeperServiceDiscovery#getInstances not deal with healthyOnly

[BurningCN]

for issue #7691

[codecov-commenter]

Codecov Report

Merging #7692 (83be59e) into master (f29663b) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master    #7692   +/-   ##
=========================================
  Coverage     59.18%   59.19%           
  Complexity      529      529           
=========================================
  Files          1076     1076           
  Lines         43540    43547    +7     
  Branches       6363     6366    +3     
=========================================
+ Hits          25771    25778    +7     
- Misses        14903    14908    +5     
+ Partials       2866     2861    -5     

Impacted Files	Coverage Δ	Complexity Δ
.../registry/zookeeper/ZookeeperServiceDiscovery.java	30.95% <0.00%> (-2.82%)	0.00 <0.00> (ø)
.../apache/dubbo/rpc/protocol/AsyncToSyncInvoker.java	62.06% <0.00%> (-10.35%)	0.00% <0.00%> (ø%)
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	86.66% <0.00%> (-1.91%)	16.00% <0.00%> (ø%)
...apache/dubbo/common/extension/ExtensionLoader.java	79.95% <0.00%> (+0.22%)	0.00% <0.00%> (ø%)
...pache/dubbo/registry/support/AbstractRegistry.java	78.51% <0.00%> (+0.37%)	0.00% <0.00%> (ø%)
...g/apache/dubbo/registry/consul/ConsulRegistry.java	60.58% <0.00%> (+0.58%)	31.00% <0.00%> (ø%)
.../dubbo/remoting/transport/netty4/NettyChannel.java	64.35% <0.00%> (+2.97%)	0.00% <0.00%> (ø%)
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	92.45% <0.00%> (+11.32%)	0.00% <0.00%> (ø%)

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