ceph-config: do not always assume containers when calculating num_osds
ceph-config: do not always assume containers when calculating num_osds

CEPH_CONTAINER_IMAGE should be None if containerized_deployment
is False.

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

ceph/ceph-ansible,ceph/ceph-ansible