config: use fact `ceph_uid`

Use fact `ceph_uid` in the task which ensures `/etc/ceph` exists in
containerized deployments.

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

roles/ceph-config/tasks/main.yml

@@ -77,11 +77,9 @@
     file:
       path: /etc/ceph
       state: directory
-      owner: 'ceph'
-      group: 'ceph'
+      owner: "{{ ceph_uid }}"
+      group: "{{ ceph_uid }}"
       mode: 0755
-    when:
-      - groups.get(mon_group_name, []) | length == 0
 
   - name: "generate {{ cluster }}.conf configuration file"
     action: config_template