mgr: use the mgr key to enable module
mgr: use the mgr key to enable module

We don't need to use the admin key for work with modules. The mgr key
has enough permissions for that.

Also removed the uncessary ceph -v command. Leftover.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

ceph/ceph-docker,JrCs/ceph-docker,JrCs/ceph-docker,JrCs/ceph-docker,ceph/ceph-docker