zk log change

[pantianying]

What this PR does:

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 #170 into develop will decrease coverage by 1.06%.
The diff coverage is 20%.

@@             Coverage Diff             @@
##           develop     #170      +/-   ##
===========================================
- Coverage    67.65%   66.58%   -1.07%     
===========================================
  Files           88       88              
  Lines         5484     5491       +7     
===========================================
- Hits          3710     3656      -54     
- Misses        1388     1450      +62     
+ Partials       386      385       -1

Impacted Files	Coverage Δ
registry/zookeeper/registry.go	62.6% <0%> (-0.8%)	⬇️
registry/zookeeper/listener.go	58.13% <33.33%> (-3.4%)	⬇️
protocol/dubbo/pool.go	59.23% <0%> (-15.77%)	⬇️
protocol/dubbo/listener.go	54.16% <0%> (-10.65%)	⬇️
protocol/dubbo/codec.go	73.52% <0%> (-8.83%)	⬇️
protocol/dubbo/readwriter.go	71.79% <0%> (-2.57%)	⬇️
registry/etcdv3/registry.go	56.89% <0%> (+1.14%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 83b3b9c...d065108. Read the comment docs.

[hxmhlt]

This function will return error. And outer function will catch the error ,continue to call logger.Error. If you need to ignore the error, I think you should modify all error catch.

[pantianying]

This function will return error. And outer function will catch the error ,continue to call logger.Error. If you need to ignore the error, I think you should modify all error catch.

For now, there is no way to print this error except by calling the Interface Methods peripherally.