Previously, the CRD yaml files did not include the objectmeta field
(metadata) that the CRD definitions themselves do include. This was
causing issues for tools that parse only the schema, such as linters.
This updates all of the yaml files to include the metadata field in
their schemae.
This allows end users to run `kubectl get vs`, for example, instead of
`kubectl get volumesnapshot`. The following short names have been
implemented:
* `VolumeSnapshot` - `vs`
* `VolumeSnapshotContent` - `vsc`, `vscs`
* `VolumeSnapshotClass` - `vsclass`, `vsclasses`
