add auth-supported config option

config.yaml

@@ -6,6 +6,15 @@ options:
       .
       This configuration element is mandatory and the service will fail on
       install if it is not provided.
+  auth-supported:
+    type: string
+    default: cephx
+    description: |
+      Which authentication flavour to use.
+      .
+      Valid options are "cephx" and "none".  If "none" is specified,
+      keys will still be created and deployed so that it can be
+      enabled later.
   monitor-secret:
     type: string
     description: |

hooks/hooks.py

@@ -33,6 +33,7 @@ def install():
 
 def emit_cephconf():
     cephcontext = {
+        'auth_supported': utils.config_get('auth-supported'),
         'mon_hosts': ' '.join(get_mon_hosts()),
         'fsid': utils.config_get('fsid'),
         }

templates/ceph.conf

@@ -1,5 +1,5 @@
 [global]
- auth supported = cephx
+ auth supported = {{ auth_supported }}
  keyring = /etc/ceph/$cluster.$name.keyring
  mon host = {{ mon_hosts }}
  fsid = {{ fsid }}