fix issue #1906

[Lapis-Hong]

Ⅰ. Describe what this PR did
add use cases

Ⅱ. Does this pull request fix one issue?
#1906

Ⅲ. Describe how you did it
1.read sourcecode
2.find out all possible situations
3.discover good and bad cases
4.test

Ⅳ. Describe how to verify it
go test ./apis/opts/ports.go ./apis/opts/ports_test.go

Ⅴ. Special notes for reviews
bad case, unexpected output
bad case, first if
bad case, second if
bad case, third if
found last if in source code is not needed, it never happens.

[pouchrobot]

Thanks for your contribution. 🍻 @Lapis-Hong
While we thought PR TITLE could be more specific, longer than 20 chars.
Please edit this PR title instead of opening a new one.
More details, please refer to https://github.com/alibaba/pouch/blob/master/CONTRIBUTING.md

[CLAassistant]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[pouchrobot]

We found this is your first time to contribute to Pouch, @Lapis-Hong
👏 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]

@Lapis-Hong Thanks for your contribution. 🍻
Please sign off in each of your commits.

[codecov-io]

Codecov Report

Merging #1983 into master will decrease coverage by 12.67%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1983       +/-   ##
===========================================
- Coverage   63.31%   50.64%   -12.68%     
===========================================
  Files         200      200               
  Lines       15522    15522               
===========================================
- Hits         9828     7861     -1967     
- Misses       4455     6503     +2048     
+ Partials     1239     1158       -81

Flag	Coverage Δ
#criv1alpha1test	33.79% <ø> (-0.06%)	⬇️
#criv1alpha2test	?
#integrationtest	38.4% <ø> (-0.03%)	⬇️
#unittest	72% <ø> (+51.13%)	⬆️

Impacted Files	Coverage Δ
cri/stream/errors.go	0% <0%> (-100%)	⬇️
cri/v1alpha2/cri_types.go	0% <0%> (-100%)	⬇️
pkg/multierror/def.go	15.38% <0%> (-84.62%)	⬇️
daemon/logger/loggerutils/tag.go	0% <0%> (-81.82%)	⬇️
cri/v1alpha2/cri_utils.go	0% <0%> (-80.16%)	⬇️
cri/v1alpha2/cri_stream.go	0% <0%> (-80%)	⬇️
cri/v1alpha2/server.go	0% <0%> (-79.85%)	⬇️
cri/v1alpha2/service/cri.go	0% <0%> (-73.34%)	⬇️
apis/opts/config/blkio.go	0% <0%> (-69.67%)	⬇️
cri/v1alpha2/cri.go	0% <0%> (-66.5%)	⬇️
... and 42 more