Allow tuning rpc_response_timeout

Sometimes we need to tune the rpc_response_timeout parameter to avoid
frequent error caused by tiemout, and it's useful to provide a native
interface to tune the timeout values.

Change-Id: I4e5c122540ff66a2782e557eb246adffcac16c99

deployment/manila/manila-base.yaml

@@ -52,6 +52,10 @@ parameters:
     type: comma_delimited_list
     default: 'noop'
     description: Driver or drivers to handle sending notifications.
+  ManilaRpcResponseTimeout:
+    default: 60
+    description: Manila's RPC response timeout, in seconds.
+    type: number
 
 outputs:
   role_data:
@@ -88,6 +92,7 @@ outputs:
         # Currently the address family parameters are mutually exclusive
         manila::network::neutron::network_plugin_ipv4_enabled:
           if: [{get_param: ManilaIPv6}, false, true]
+        manila::rpc_response_timeout: {get_param: ManilaRpcResponseTimeout}
       service_config_settings:
         mysql:
           manila::db::mysql::password: {get_param: ManilaPassword}