ceph-mon: Fix cluster name parameter

The ability to add nodes with the monitor role to an existing cluster
whose name differs from the default name is fixed.

Signed-off-by: ilyashestopalov <usr.tester@yandex.ru>
(cherry picked from commit 904532c5e2)

roles/ceph-mon/tasks/deploy_monitors.yml

@@ -1,7 +1,7 @@
 ---
 - name: check if monitor initial keyring already exists
   command: >
-    {{ hostvars[groups[mon_group_name][0]]['container_exec_cmd'] | default('') }} ceph --cluster ceph --name mon. -k
+    {{ hostvars[groups[mon_group_name][0]]['container_exec_cmd'] | default('') }} ceph --cluster {{ cluster }} --name mon. -k
     /var/lib/ceph/mon/{{ cluster }}-{{ hostvars[groups[mon_group_name][0]]['ansible_hostname'] }}/keyring
     auth get-key mon.
   register: initial_mon_key