minor fixes for shell variables and spelling

[ofrzeta]

• environment variables consistency
• GOPATH defaults to $HOME/go starting with Go 1.8
• minor typo

Signed-off-by: Oliver Frommel [email protected]

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[pouchrobot]

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

[fuweid]

LGTM
wait for the CI

[codecov-io]

Codecov Report

Merging #2220 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #2220      +/-   ##
=========================================
- Coverage   64.94%   64.9%   -0.05%     
=========================================
  Files         208     208              
  Lines       16728   16728              
=========================================
- Hits        10864   10857       -7     
- Misses       4517    4522       +5     
- Partials     1347    1349       +2

Flag	Coverage Δ
#criv1alpha1test	32.99% <ø> (+0.01%)	⬆️
#criv1alpha2test	33.69% <ø> (+0.19%)	⬆️
#integrationtest	39.96% <ø> (-0.01%)	⬇️
#unittest	23.83% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
apis/server/utils.go	61.9% <0%> (-4.77%)	⬇️
ctrd/watch.go	75.75% <0%> (-4.55%)	⬇️
cri/v1alpha1/cri.go	62.22% <0%> (-0.34%)	⬇️
daemon/mgr/container.go	56.76% <0%> (-0.21%)	⬇️
cri/v1alpha2/cri.go	62.77% <0%> (+0.31%)	⬆️