Currently, if eviction is supported during a drain operation,
eviction is always used.
This commit allows the user to specify disabling eviction.
This is particularly useful when you wish to ignore
PodDisruptionBudgets after a normal drain has failed for
some time.
Kubernetes-commit: 6c1d587d5142b95e6c169a198a086332a7e4d8ad
When there's a pod that can't be evicted/deleted, and apiserver
connection breaks at a wrong moment, kubectl can panic due
to nil pointer dereference. This PR also improves drain tests
to avoid confusing panics with fatal errors.
Kubernetes-commit: 37226f8e8306475895d7e68eb52c57e57f00ee28
Michael Gugino