test: add unit-test for proxy/has port

[mengjiahao]

Ⅰ. Describe what this PR did

#1641 add unit-test for proxy/has port

Ⅱ. Does this pull request fix one issue?

NONE

Ⅲ. Describe how you did it

NONE

Ⅳ. Describe how to verify it

NONE

Ⅴ. Special notes for reviews

NONE

[pouchrobot]

We found this is your first time to contribute to Pouch, @mengjiahao
👏 We really appreciate it.
Just remind that you have read the contribution guide: https://github.com/alibaba/pouch/blob/master/CONTRIBUTING.md
If you didn't, you should do that first. If done, welcome again and please enjoy hacking! 🍻

[pouchrobot]

@mengjiahao Thanks for your contribution. 🍻
Please sign off in each of your commits.

[codecov-io]

Codecov Report

Merging #1668 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1668      +/-   ##
==========================================
+ Coverage   41.16%   41.17%   +0.01%     
==========================================
  Files         274      274              
  Lines       18091    18091              
==========================================
+ Hits         7447     7449       +2     
- Misses       9729     9730       +1     
+ Partials      915      912       -3

Impacted Files	Coverage Δ
daemon/mgr/system.go	75% <0%> (-1.73%)	⬇️
ctrd/image.go	77.47% <0%> (-0.55%)	⬇️
daemon/mgr/container.go	50.23% <0%> (+0.15%)	⬆️
ctrd/image_proxy_util.go	9.37% <0%> (+1.56%)	⬆️
daemon/logger/jsonfile/utils.go	73.17% <0%> (+1.62%)	⬆️

[allencloud]

LGTM, thanks a lot for your work. @mengjiahao