ceph-validate: do not check ceph version on dev or rhcs installs
ceph-validate: do not check ceph version on dev or rhcs installs

A dev or rhcs install does not require ceph_stable_release to be set and
instead generates that by looking at the installed ceph-version.
However, at this point in the playbook ceph may not have been installed
yet and ceph-common has not be run.

Fixes: https://github.com/ceph/ceph-ansible/issues/2618

Signed-off-by: Andrew Schoen <1bb641dc23c3a93cce4eee683bcf4b2bea7903a3@redhat.com>

ceph/ceph-ansible,fgal/ceph-ansible,font/ceph-ansible,ceph/ceph-ansible,fgal/ceph-ansible,font/ceph-ansible