[Openstack-stable-maint] Stable check of openstack/keystone for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/81a692cbb1fb408882e274d96d1ffa... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/66f13bfcfe444f45b9781e5497306a9d : SUCCESS in 10m 53s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/34bf93e51667485cb8970ba0b2607444 : RETRY_LIMIT in 2m 35s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/3dd7f04dbffa4f2a9cee424d989e3eec : SUCCESS in 11m 47s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/385d8efa50944a269aef8f14368ee15b : SUCCESS in 29m 19s