tests: change container image tag for switch_to_containers
tests: change container image tag for switch_to_containers

test switch_to_containers job against the latest ceph@master
ceph-container image tag available.
In order to be sure the ceph release deployed in the first step (non
containerized deployment) isn't newer than the tag used for the
containerized migration (which would mean we try to downgrade the
version).

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible