When configuring encrypted on-pvc clusters we now set the cluster fsid
in the LUKS header. If needed we can then determine if the encrypted
block is part of our cluster or not. We also attach the pvc_name in case
it might become useful.
Closes: https://github.com/rook/rook/issues/7991
Signed-off-by: Sébastien Han <seb@redhat.com>