switch: disable ceph-disk units

switch: disable ceph-disk units

During the transition from jewel non-container to container old ceph
units are disabled. ceph-disk can still remain in some cases and will
appear as 'loaded failed', this is not a problem although operators
might not like to see these units failing. That's why we remove them if
we find them.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1577846
Signed-off-by: Sébastien Han <seb@redhat.com>
(cherry picked from commit 49a47124859e6577fb99e6dd680c5244ccd6f38f)
Signed-off-by: Sébastien Han <seb@redhat.com>