switch: copy initial mon keyring

We need to copy this key into /etc/ceph so when ceph-docker-common runs
it can fetch it to the ansible server. Previously the task wasn't not
failing because `fail_on_missing` was False before 2.5, so now it's True
hence the failure.

Signed-off-by: Sébastien Han <seb@redhat.com>

infrastructure-playbooks/switch-from-non-containerized-to-containerized-ceph-daemons.yml

@@ -109,6 +109,13 @@
       failed_when: false
       when: ldb_files.rc == 0
 
+    - name: copy mon initial keyring in /etc/ceph to satisfy fetch config task in ceph-docker-common
+      command: cp /var/lib/ceph/mon/{{ cluster }}-{{ ansible_hostname }}/keyring /etc/ceph/{{ cluster }}.mon.keyring
+      args:
+        creates: /etc/ceph/{{ cluster }}.mon.keyring
+      changed_when: false
+      failed_when: false
+
   roles:
     - ceph-defaults
     - ceph-handler