[Ftr] lint codes fix.

[cityiron]

What this PR does:

Which issue(s) this PR fixes:

Fixes #933

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-io]

Codecov Report

Merging #941 (3dc72d2) into develop (e2954fe) will decrease coverage by 0.07%.
The diff coverage is 42.85%.

@@             Coverage Diff             @@
##           develop     #941      +/-   ##
===========================================
- Coverage    59.92%   59.85%   -0.08%     
===========================================
  Files          260      261       +1     
  Lines        12840    12909      +69     
===========================================
+ Hits          7695     7727      +32     
- Misses        4186     4229      +43     
+ Partials       959      953       -6     

Impacted Files	Coverage Δ
cluster/router/condition/router.go	78.91% <0.00%> (ø)
common/proxy/proxy.go	90.19% <ø> (+0.87%)	⬆️
common/proxy/proxy_factory/default.go	13.33% <0.00%> (-0.23%)	⬇️
common/rpc_service.go	88.11% <ø> (ø)
config_center/file/impl.go	52.47% <ø> (ø)
...lter_impl/tps/tps_limit_sliding_window_strategy.go	100.00% <ø> (ø)
metadata/service/remote/service.go	39.72% <0.00%> (ø)
registry/consul/registry.go	49.33% <0.00%> (ø)
registry/zookeeper/registry.go	48.17% <0.00%> (-2.19%)	⬇️
remoting/getty/getty_client.go	41.97% <ø> (ø)
... and 30 more

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