Add unit-test for httpstream's IsUpgradeRequest, negotiateProtocol, Handshake methods

[gfl699468]

Ⅰ. Describe what this PR did

Add unit-test for httpstream's IsUpgradeRequest, negotiateProtocol, Handshake methods

Ⅱ. Does this pull request fix one issue?

fixes parts of #1756

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

run
go test ./cri/stream/httpstream/httpstream_test.go ./cri/stream/httpstream/httpstream.go

Ⅴ. Special notes for reviews

baiji group 1

[pouchrobot]

@gfl699468 Thanks for your contribution. 🍻
Please sign off in each of your commits.

[pouchrobot]

We found this is your first time to contribute to Pouch, @gfl699468
👏 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! 🍻

[codecov-io]

Codecov Report

Merging #1800 into master will increase coverage by 0.2%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #1800     +/-   ##
=========================================
+ Coverage    56.3%   56.51%   +0.2%     
=========================================
  Files         200      200             
  Lines       15657    15657             
=========================================
+ Hits         8816     8848     +32     
+ Misses       5745     5720     -25     
+ Partials     1096     1089      -7

Flag	Coverage Δ
#critest	33.52% <ø> (+0.04%)	⬆️
#integrationtest	37.69% <ø> (+0.03%)	⬆️
#unittest	20.48% <ø> (+0.15%)	⬆️

Impacted Files	Coverage Δ
ctrd/watch.go	71.87% <0%> (-3.13%)	⬇️
cri/v1alpha2/cri.go	66.13% <0%> (+0.17%)	⬆️
daemon/mgr/container.go	53.46% <0%> (+0.31%)	⬆️
ctrd/container.go	50.17% <0%> (+1.37%)	⬆️
ctrd/image.go	81.18% <0%> (+4.45%)	⬆️
cri/stream/httpstream/httpstream.go	96.29% <0%> (+59.25%)	⬆️

[YaoZengzeng]

We have merged a PR which solve the same problem

Thanks for your work

Close this now :)