some ceph changes

roles/nova-compute/templates/nova-compute.service

@@ -45,7 +45,7 @@ ExecStart=/usr/bin/docker run --name %n \
     -v /var/lib/nova/instances:/var/lib/nova/instances \
     -v /lib/modules:/lib/modules \
     -v /etc/machine-id:/etc/machine-id \
-    -v /srv/nova-compute/etc/ceph:/etc/ceph \
+    -v /etc/ceph:/etc/ceph \
     --network host \
     {{ docker_image }} /etc/run.sh