Allow emitting PersistentVolume events.
Allow emitting PersistentVolume events.

Similarly to Nodes, PersistentVolumes are not in any namespace and we should
not block events on them. Currently, these events are rejected with
'Event "nfs.145841cf9c8cfaf0" is invalid: involvedObject.namespace: Invalid value: "": does not match involvedObject'

Kubernetes-commit: 4ab91066d091350a64746c558d5edcd02b82069b

kubernetes/api