preserveUnknownField set to false, comments updates, adding pull request annotation
more comment updates
VolumeSnapshot comments
rename to VolumeSnapshotClassName
adding license
Splitting out the RBAC definitions into a separate file has the
advantage that it can be used as-is without editing in other
deployments. For example, the kubernetes-csi/docs example can
use this rbac.yaml file instead of a local copy.
While at it, the upstream external-provisioner RBAC file gets used,
which fixes the too broad permissions for "endpoints".
