ceph-volume: consume mount opt in simple activate

ceph-volume: consume mount opt in simple activate

When running ceph-volume simple activate command on a Filestore OSD
then the data device is mounted without any specific options so the
one from the ceph configuration file are ignored.
When deploying Filestore with the lvm subcommand then everything is
fine because the filestore_activate method uses mount_osd which relies
on the mount options defined in the ceph configuration file (if any).

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1891557
Fixes: https://tracker.ceph.com/issues/48018
Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>