Fix: etcd cluster reconnect

[watermelo]

What this PR does:
fix etcd cluster reconnect

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-io]

Codecov Report

Merging #828 into develop will increase coverage by 0.24%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop     #828      +/-   ##
===========================================
+ Coverage    59.80%   60.04%   +0.24%     
===========================================
  Files          259      260       +1     
  Lines        12752    12770      +18     
===========================================
+ Hits          7626     7668      +42     
+ Misses        4171     4140      -31     
- Partials       955      962       +7     

Impacted Files	Coverage Δ
remoting/etcdv3/facade.go	0.00% <0.00%> (ø)
metadata/report/delegate/delegate_report.go	29.66% <0.00%> (-9.33%)	⬇️
cluster/router/healthcheck/default_health_check.go	94.11% <0.00%> (-5.89%)	⬇️
remoting/kubernetes/watch.go	75.00% <0.00%> (-4.35%)	⬇️
remoting/kubernetes/client.go	72.72% <0.00%> (-3.04%)	⬇️
remoting/kubernetes/registry_controller.go	50.20% <0.00%> (-1.23%)	⬇️
protocol/dubbo/dubbo_invoker.go	75.00% <0.00%> (-1.06%)	⬇️
config/config_loader.go	53.15% <0.00%> (ø)
registry/consul/utils.go	67.50% <0.00%> (ø)
registry/nacos/registry.go	50.74% <0.00%> (ø)
... and 12 more

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