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This change stops to update status in CNI's DEL command. There are two reasons:
cmd DEL is invoked at only pod deletion, hence k8s does not guarantee the pod and it may be already deleted. Hence this API may failed.
In stateful set's pod recreation case, it may have race condition to update the status at cmd DEL case.
In stateful set case, same pod name, i.e. stateful-0, is deleted and then created again. In this case, if old Pod's CNI DEL command is not finished before new Pod's creation, then SetStatus function is failed due to pod UID mismatch.