test: add test cases about modifyHostConfig

[starnop]

Signed-off-by: Starnop starnop@163.com

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

fixes part of #1756

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #2056 into master will increase coverage by 5.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2056      +/-   ##
==========================================
+ Coverage   58.89%   64.03%   +5.14%     
==========================================
  Files         202      202              
  Lines       15535    15535              
==========================================
+ Hits         9149     9948     +799     
+ Misses       5283     4352     -931     
- Partials     1103     1235     +132

Flag	Coverage Δ
#criv1alpha1test	33.73% <ø> (?)
#criv1alpha2test	34.26% <ø> (+0.07%)	⬆️
#integrationtest	38.45% <ø> (-0.02%)	⬇️
#unittest	23.16% <ø> (+0.46%)	⬆️

Impacted Files	Coverage Δ
daemon/mgr/system.go	76.92% <0%> (-1.71%)	⬇️
daemon/mgr/container.go	53.89% <0%> (+0.15%)	⬆️
cri/v1alpha2/cri.go	66.2% <0%> (+0.17%)	⬆️
cri/v1alpha2/cri_utils.go	82.12% <0%> (+0.63%)	⬆️
ctrd/container.go	50.17% <0%> (+1.37%)	⬆️
ctrd/watch.go	75.75% <0%> (+3.03%)	⬆️
cri/criservice.go	64.7% <0%> (+24.99%)	⬆️
cri/v1alpha1/cri_utils.go	83.45% <0%> (+27.4%)	⬆️
cri/v1alpha1/cri_wrapper.go	55.8% <0%> (+55.8%)	⬆️
cri/v1alpha1/cri.go	65.36% <0%> (+65.36%)	⬆️
... and 4 more

[YaoZengzeng]

LGTM