Pull cinder cephx keyring only when cinder_backup_ceph is true in nova

Change-Id: Ia766c1aa60d51fbff2c620394474597a7146b9cc
Closes-Bug: #1699658

ansible/roles/nova/tasks/ceph.yml

@@ -48,6 +48,8 @@
   command: docker exec ceph_mon ceph auth get-key client.cinder
   register: cinder_cephx_raw_key
   delegate_to: "{{ groups['ceph-mon'][0] }}"
+  when:
+    - cinder_backend_ceph | bool
   changed_when: False
   run_once: True
 
@@ -72,7 +74,7 @@
       enabled: true
     - uuid: "{{ cinder_rbd_secret_uuid }}"
       name: client.cinder secret
-      enabled: "{{ cinder_backend_ceph }}"
+      enabled: "{{ cinder_backend_ceph | bool }}"
 
 - name: Pushing secrets key for libvirt
   copy:
@@ -88,4 +90,4 @@
       enabled: true
     - uuid: "{{ cinder_rbd_secret_uuid }}"
       content: "{{ cinder_cephx_raw_key.stdout }}"
-      enabled: "{{ cinder_backend_ceph }}"
+      enabled: "{{ cinder_backend_ceph | bool }}"