Update uuidutils from openstack common.

Change-Id: I91fe13eb7dda8aa64187ce5a6d2c34dacdc9f1bb

nova/openstack/common/uuidutils.py

@@ -22,6 +22,10 @@ UUID related utilities and helper functions.
 import uuid
 
 
+def generate_uuid():
+    return str(uuid.uuid4())
+
+
 def is_uuid_like(val):
     """Returns validation of a value as a UUID.