Add meta-comments to manifests to allow basic templating via `sed`.
Add the following types of meta-comments:
- # namespace:X
- A basic namespace
- replace the field with a namespace for X
- # serviceaccount:namespace:X
- A service account namespace for SCC
- e.g., "system:serviceaccount:<ns>:rook-ceph-system"
- Replace the namespace "<ns>" with with a namespace for X
- # provisioner:namespace:X
- A provisioner identifier with namespace prefix
- e.g., "<ns>.cephfs.csi.ceph.com"
- e.g., "<ns>.ceph.rook.io/bucket"
- Replace the namespace "<ns>" with a namespace for X
Signed-off-by: Blaine Gardner <blaine.gardner@redhat.com>