test: avoid port conflict

[felix021]

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en: many tests are using the same port 8121, but go will run tests in parallel, which often results in port conflict.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ed2f1fd) 68.16% compared to head (fdf6e42) 68.13%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1177      +/-   ##
===========================================
- Coverage    68.16%   68.13%   -0.04%     
===========================================
  Files          255      255              
  Lines        19395    19395              
===========================================
- Hits         13220    13214       -6     
- Misses        4977     4988      +11     
+ Partials      1198     1193       -5     

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[AsterDY]

人工去重容易漏，不如搞个工具函数全局分发一下address？

[felix021]

人工去重容易漏，不如搞个工具函数全局分发一下address？

下次吧 :D