tests: force using the more recent build
tests: force using the more recent build

We should use  `latest-master-devel` for switch_to_containers job.
Otherwise it might happen we actually downgrade the ceph version when
the image used is older than the rpm initially used for installing ceph.

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

ceph/ceph-ansible,ceph/ceph-ansible