Add return value for create_volume method.

cloudcontrol/node/hypervisor/__init__.py

@@ -679,6 +679,8 @@ class StorageIndex(object):
         # and also to its storage pool
         self.storages[new_volume.storage].volumes[new_volume.name] = new_volume
 
+        return new_volume
+
     def delete_volume(self, pool_name, volume_name):
         """Delete a volume in the givent storage pool.