create an python object from json string

when calling the post message for event

Depeneds-On: I6f9d7de1c34362090f56ec03c8fe03d5d06fa1fb
Change-Id: I3322292e7d69325ba102f1a8e74ab0ce6c1266ed

vitrageclient/v1/cli/event.py

@@ -12,6 +12,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import json
+
 from cliff import command
 from datetime import datetime
 
@@ -58,4 +60,4 @@ class EventPost(command.Command):
 
         self.app.client.event.post(event_time=event_time,
                                    event_type=event_type,
-                                   details=details)
+                                   details=json.loads(details))