fix deadlock between play kube and cleanup #2
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There was a deadlock between two concurrent processes: play kube and cleanup,
that is called after container exit when RestartPolicy is used. Before the fix,
the cleanup command didn't lock Pod's lock, so there was a possibility of
obtaining two locks in different order in two processes.
[NO NEW TESTS NEEDED]
Closes containers#14921
Does this PR introduce a user-facing change?