docs: update the doc of deploy kubernetes with PouchContainer

[starnop]

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

Ⅰ. Describe what this PR did

After verification, our documentation is not enough for users to quickly build the environment. Now we update the items as follows:

1. s/pouch/pouchcontainer
2. add configuration instructions of CONTAINERD_ADDR
3. create a new drop-in file instead of modifying the file created by the kubeadm
4. correct any inappropriateness in the document

Ⅱ. Does this pull request fix one issue?

None.

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

just docs.

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

About more info about kubeadm/kubelet , please refer to:
kubernetes/kubeadm#822
https://v1-11.docs.kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm-init/

[codecov]

Codecov Report

Merging #2294 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #2294      +/-   ##
=========================================
+ Coverage   66.74%   66.8%   +0.05%     
=========================================
  Files         211     211              
  Lines       17205   17205              
=========================================
+ Hits        11484   11493       +9     
+ Misses       4316    4309       -7     
+ Partials     1405    1403       -2

Flag	Coverage Δ
#criv1alpha1test	32.19% <ø> (+0.05%)	⬆️
#criv1alpha2test	35.85% <ø> (-0.02%)	⬇️
#integrationtest	39.83% <ø> (-0.01%)	⬇️
#nodee2etest	33.01% <ø> (+0.01%)	⬆️
#unittest	23.46% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
daemon/containerio/cri_log_file.go	84.31% <0%> (-3.93%)	⬇️
cri/v1alpha2/cri_wrapper.go	60% <0%> (-2.4%)	⬇️
ctrd/container.go	59.28% <0%> (ø)	⬆️
cri/v1alpha2/cri.go	65.74% <0%> (ø)	⬆️
daemon/mgr/container.go	57.43% <0%> (+0.2%)	⬆️
cri/v1alpha2/cri_utils.go	90.57% <0%> (+0.28%)	⬆️
cri/v1alpha1/cri.go	60.7% <0%> (+0.32%)	⬆️
ctrd/watch.go	80.3% <0%> (+4.54%)	⬆️
apis/server/utils.go	66.66% <0%> (+4.76%)	⬆️
cri/ocicni/cni_manager.go	80% <0%> (+15%)	⬆️

[allencloud]

How about removing this line? @starnop

[starnop]

updated! ^_^

[allencloud]

Why has containerd's address changed? I think it is a big incompatibility there when deployment of kubernetes. @starnop
Could you show more details about this?

[starnop]

@allencloud
cadvisor has updated the address for no reason in this PR:
https://github.com/google/cadvisor/pull/1919/files

And Kubernetes update the cadvisor ,that's where the difference comes in:
kubernetes/kubernetes#64800

[allencloud]

LGTM