Integrate CRI and containerd file system stats

[bobbypage]

Merging following PRs back to master:

#2955
#2946
#2944
#2943
#2938
#2936
#2931
#2923

Main changes:

• Fix the first alias of container reference for containerd - Fix the first alias of container reference #2931
• Add k8s/cri-api to cAdvisor - Add kubernetes/cri-api to cAdvisor #2938
• Add missing file system metrics in containerd handler - Add missing file system metrics in containerd handler #2936

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[bobbypage]

/cc @qiutongs