docs: manual of container labels and annotaions under cri

[zhuangqh]

Signed-off-by: zhuangqh zhuangqhc@gmail.com

Ⅰ. Describe what this PR did

• add missing document for vm pass through config annotation
• explain the container label rule under CRI implement

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]

Codecov Report

Merging #2672 into master will increase coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2672      +/-   ##
==========================================
+ Coverage   69.34%   69.38%   +0.04%     
==========================================
  Files         278      278              
  Lines       17428    17428              
==========================================
+ Hits        12085    12093       +8     
+ Misses       3994     3989       -5     
+ Partials     1349     1346       -3

Flag	Coverage Δ
#criv1alpha2_test	39.23% <0%> (ø)	⬆️
#integration_test_0	36.56% <0%> (ø)	⬆️
#integration_test_1	35.34% <0%> (ø)	⬆️
#integration_test_2	36.49% <0%> (-0.05%)	⬇️
#integration_test_3	35.4% <0%> (+0.02%)	⬆️
#node_e2e_test	35.02% <0%> (+0.02%)	⬆️
#unittest	28.78% <0%> (ø)	⬆️

Impacted Files	Coverage Δ
cri/v1alpha2/cri.go	70.97% <0%> (+0.38%)	⬆️
daemon/logger/jsonfile/utils.go	71.54% <0%> (-1.63%)	⬇️
ctrd/client.go	69.72% <0%> (-1.63%)	⬇️
pkg/meta/store.go	67.44% <0%> (-1.56%)	⬇️
daemon/mgr/container_utils.go	82.38% <0%> (-1.14%)	⬇️
ctrd/container.go	54.64% <0%> (+0.37%)	⬆️
daemon/mgr/container.go	60.04% <0%> (+0.63%)	⬆️
cri/ocicni/cni_manager.go	70.58% <0%> (+11.76%)	⬆️

[allencloud]

Can we use RuntimeClass in Kubernetes to support runv/Kata which is described in #2314? @starnop @zhuangqh

[zhuangqh]

We use annotations to support runtime choosing for legacy kubernetes. RuntimeHandler of kubernetes 1.12 is also supported

[allencloud]

If that, I think we should add detailed instructions in this document.

< 1.12, suggest using annotation;
>= 1.12, use runtime class

In addition, we should have a plan whether to deprecate the annotation for future.

[CLAassistant]

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[cxz66666]

RuntimeClass is a stable feature and the url is deprecated, could you help to fix them? Also there have a merge conflict, thanks to rebase it!

[cxz66666]

Maybe we need set correctly markdown anchor point here and follows, e.g. VM passthrough config (#vm-passthrough-config "VM passthrough config") 👍

[cxz66666]

Hope you can fix these questions

[cxz66666]

Thank you for your contribution! because you don't response for a long time, I will close this PR and reopen another one. ❤️