Fix for bug #788265.

Remove created_at, updated_at and deleted_at from instance_type dict returned by methods in sqlalchemy API.

nova/utils.py

@@ -526,6 +526,16 @@ def loads(s):
     return json.loads(s)
 
 
+try:
+    import anyjson
+except ImportError:
+    pass
+else:
+    anyjson._modules.append(("nova.utils", "dumps", TypeError,
+                                           "loads", ValueError))
+    anyjson.force_implementation("nova.utils")
+
+
 _semaphores = {}