crictl: add option to filter by container name in ps

[runcom]

This way users can do one liner like this one to grab logs out of a particular container:

crictl logs $(crictl ps --pod $(crictl pods --name kube-dns -q) --name kubedns -q)

Signed-off-by: Antonio Murdaca [email protected]

[k8s-ci-robot]

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[Random-Liu]

cmd/crictl/sandbox_test.go:63:9:warning: undefined: podMatchesRegex (vetshadow)
cmd/crictl/sandbox_test.go:63:9:error: undefined: podMatchesRegex (vet)

[runcom]

Oh gosh, fixing that

[runcom]

@Random-Liu fixed

[feiskyer]

/lgtm