fix: avoid extra logger wraps

[Reasno]

the extra wrap hinders the correctness of runtime.Caller() stack level.

[codecov]

Codecov Report

Merging #232 (be45e0d) into master (99d0912) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #232      +/-   ##
==========================================
- Coverage   83.61%   83.50%   -0.11%     
==========================================
  Files         102      102              
  Lines        3795     3796       +1     
==========================================
- Hits         3173     3170       -3     
- Misses        459      461       +2     
- Partials      163      165       +2     

Impacted Files	Coverage Δ
c.go	77.57% <100.00%> (+0.13%)	⬆️
logging/log.go	42.25% <100.00%> (ø)
config/remote/etcd/etcd.go	84.84% <0.00%> (-6.07%)	⬇️
config/watcher/file.go	62.79% <0.00%> (-4.66%)	⬇️

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