test: add ut for pkg/common/hlog

[L2ncE]

What type of PR is this?

test

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• [x] This PR title match the format: <type>(optional scope): <description>
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(Optional) More detail description for this PR(en: English/zh: Chinese).

en: add ut for pkg/common/hlog, coverage rate reached 81.4%

Which issue(s) this PR fixes:

#293

[codecov[bot]]

Codecov Report

Base: 64.46% // Head: 64.88% // Increases project coverage by +0.41% :tada:

Coverage data is based on head (565fd16) compared to base (b4ba993). Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #298      +/-   ##
===========================================
+ Coverage    64.46%   64.88%   +0.41%     
===========================================
  Files           84       88       +4     
  Lines         8288     8463     +175     
===========================================
+ Hits          5343     5491     +148     
- Misses        2583     2608      +25     
- Partials       362      364       +2     

Impacted Files	Coverage Δ
pkg/common/hlog/hlog.go	80.00% <0.00%> (ø)
pkg/common/hlog/default.go	83.83% <0.00%> (ø)
pkg/common/hlog/log.go	100.00% <0.00%> (ø)
pkg/common/hlog/system.go	85.96% <0.00%> (ø)

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[li-jin-gou]

Good job