refine config_client listen config

[binbin0325]

fix:#640

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.06% ⚠️

Comparison is base (b8f432f) 30.10% compared to head (f0ef9ed) 30.04%.

❗ Current head f0ef9ed differs from pull request most recent head 21988be. Consider uploading reports for the commit 21988be to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #644      +/-   ##
==========================================
- Coverage   30.10%   30.04%   -0.06%     
==========================================
  Files          40       40              
  Lines        3063     3069       +6     
==========================================
  Hits          922      922              
- Misses       2074     2080       +6     
  Partials       67       67              

Files Changed	Coverage Δ
clients/config_client/config_client.go	37.13% <0.00%> (-0.75%)	⬇️

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