Merge "Fix missing oslo.versionedobjects library option"

Author: Zuul

etc/magnum/magnum-config-generator.conf

@@ -11,4 +11,5 @@ namespace = oslo.middleware.cors
 namespace = oslo.policy
 namespace = oslo.service.periodic_task
 namespace = oslo.service.service
+namespace = oslo.versionedobjects
 namespace = keystonemiddleware.auth_token