Currently, some circumstances may cause waitForDelete to
never succeed after the pod has been marked for deletion.
In particular, Nodes that are unresponsive and have
pods with local-storage will not be able to
successfully drain.
We should allow drain to ignore pods that have a
DeletionTimestamp older than a user-provided age.
This will allow controllers utilizing kubectl/drain
to optionally account for a pod that cannot be
removed due to a misbehaving node.
Kubernetes-commit: da53044abdf8c8a9771a5c3dfd861f0c4ec78c40
Mike Danese