Add more field's in InstancePayload

Add instance's locked field and instance's
display_description field in InstancePayload.

Implements: bp additional-notification-fields-for-searchlight

Change-Id: Iceae25ca8a0d7f2e5f22cab1364215bda2fae93c

doc/notification_samples/instance-restore-end.json

@@ -7,6 +7,7 @@
             "created_at":"2012-10-29T13:42:11Z",
             "deleted_at":null,
             "display_name":"some-server",
+            "display_description":"some-server",
             "fault":null,
             "host":"compute",
             "host_name":"some-server",
@@ -28,6 +29,7 @@
             "launched_at":"2012-10-29T13:42:11Z",
             "image_uuid": "155d900f-4e14-4e4c-a73d-069cbf4541e6",
             "metadata":{},
+            "locked":false,
             "node":"fake-mini",
             "os_type":null,
             "progress":0,
@@ -55,8 +57,8 @@
         },
         "nova_object.name":"InstanceActionPayload",
         "nova_object.namespace":"nova",
-        "nova_object.version":"1.0"
+        "nova_object.version":"1.1"
     },
     "priority":"INFO",
     "publisher_id":"nova-compute:compute"
-}
+}