Automatic merge from submit-queue
rkt: Improve support for privileged pod (pod whose all containers are privileged)
Fix https://github.com/kubernetes/kubernetes/issues/31100
This takes advantage of https://github.com/coreos/rkt/pull/2983 . By appending the new `--all-run` insecure-options to `rkt run-prepared` command when all the containers are privileged. The pod now gets more privileged power.
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