ceph-mds: delete duplicate tasks which cause multimds container deployments to fail.

ceph-mds: delete duplicate tasks which cause multimds container deployments to fail.

This update will resolve error['cephfs' is undefined.] in multimds container deployments.
See: roles/ceph-mon/tasks/create_mds_filesystems.yml. The same last two tasks are present there, and actully need to happen in that role since "{{ cephfs }}" gets defined in
roles/ceph-mon/defaults/main.yml, and not roles/ceph-mds/defaults/main.yml.

Signed-off-by: Randy J. Martinez <ramartin@redhat.com>
(cherry picked from commit ca572a11f1eb7ded5583c8d8b810a42db61cd98f)
Signed-off-by: Sébastien Han <seb@redhat.com>