bugfix: remove useless noop cni manager and speak loudly if init cni manager failed

[YaoZengzeng]

Ⅰ. Describe what this PR did

Now if we initialize CNI manager failed we only output the error message

And the CNI Manager will become a noop manager which implement all the interfaces but do nothing

Actually the noop CNI Manager is misleading which may make the user feel that everything is OK

So we should remove the noop CNI Manager and speak loudly when we initialize it failed.

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

[codecov-io]

Codecov Report

Merging #2194 into master will increase coverage by 0.09%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master    #2194      +/-   ##
==========================================
+ Coverage   64.86%   64.95%   +0.09%     
==========================================
  Files         209      208       -1     
  Lines       16739    16732       -7     
==========================================
+ Hits        10858    10869      +11     
+ Misses       4527     4511      -16     
+ Partials     1354     1352       -2

Flag	Coverage Δ
#criv1alpha1test	32.67% <30%> (-0.03%)	⬇️
#criv1alpha2test	33.63% <30%> (+0.18%)	⬆️
#integrationtest	39.91% <0%> (-0.02%)	⬇️
#unittest	23.95% <0%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
cri/v1alpha1/cri.go	62.39% <33.33%> (-0.22%)	⬇️
cri/v1alpha2/cri.go	63.45% <33.33%> (+0.11%)	⬆️
cri/ocicni/cni_manager.go	60% <50%> (+3.9%)	⬆️
apis/server/utils.go	61.9% <0%> (-4.77%)	⬇️
pkg/meta/store.go	62.5% <0%> (-1.57%)	⬇️
daemon/mgr/container_utils.go	83.13% <0%> (-1.21%)	⬇️
ctrd/image.go	77.19% <0%> (+0.43%)	⬆️
daemon/mgr/container.go	56.98% <0%> (+0.61%)	⬆️
ctrd/container.go	53.82% <0%> (+0.95%)	⬆️
... and 1 more

[fuweid]

LGTM