[dubbo-4097] fix registry of etcd set 'group' cannot isolate

[kaori-seasons]

What is the purpose of the change

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Verifying this change

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fix registry of etcd set 'group' cannot isolate #4097

[tswstarplanet]

you can add "fix #xxx" in the "What is the purpose of the change" section, this may link the pr to the corresponding issue

[kaori-seasons]

you can add "fix #xxx" in the "What is the purpose of the change" section, this may link the pr to the corresponding issue

Hello, I have added #4097

[codecov-io]

Codecov Report

Merging #4825 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #4825      +/-   ##
============================================
- Coverage     61.17%   61.15%   -0.02%     
+ Complexity      424      423       -1     
============================================
  Files           919      919              
  Lines         37487    37491       +4     
  Branches       5461     5462       +1     
============================================
- Hits          22933    22928       -5     
- Misses        12049    12050       +1     
- Partials       2505     2513       +8

Impacted Files	Coverage Δ	Complexity Δ
...a/org/apache/dubbo/registry/etcd/EtcdRegistry.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../apache/dubbo/rpc/protocol/AsyncToSyncInvoker.java	70.83% <0%> (-8.34%)	0% <0%> (ø)
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0%> (-4.35%)	0% <0%> (ø)
...he/dubbo/remoting/transport/netty/NettyServer.java	70.17% <0%> (-3.51%)	8% <0%> (-1%)
...c/main/java/org/apache/dubbo/rpc/RpcException.java	80% <0%> (-3.34%)	0% <0%> (ø)
...g/apache/dubbo/rpc/protocol/rest/RestProtocol.java	68.21% <0%> (-3.11%)	0% <0%> (ø)
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	87.85% <0%> (-2.81%)	16% <0%> (-1%)
...dubbo/remoting/exchange/support/DefaultFuture.java	67.27% <0%> (-1.82%)	0% <0%> (ø)
...he/dubbo/registry/multicast/MulticastRegistry.java	67.87% <0%> (-1.81%)	0% <0%> (ø)
...rg/apache/dubbo/common/timer/HashedWheelTimer.java	62.75% <0%> (-0.35%)	0% <0%> (ø)
... and 7 more

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