Beginning with the Pacific release, Ceph pools are not allowed to
use 1x replication by default. This is problematic for the
openstack-helm gate scripts, which frequently use 1x replication
for automated testing. This change adds Ceph configuration and
command overrides to allow those gate scripts to continue to use
1x replication for testing.
Change-Id: I21ed3e43f3773d5ea830959f1b66b35f38185ca7
46beb87574