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

Build failed. https://zuul.opendev.org/t/openstack/buildset/e7ddc36512474eb09548c277b13f67... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/597d84efba1e469db33bc46f6e0f2dfd : SUCCESS in 14m 14s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/9da33711036f471a8cf6745c4b95bb01 : FAILURE in 14m 26s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/fd5caebb82ed45bb95d7d6e4c8fba9b9 : SUCCESS in 14m 17s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/696f62e4f8b44a82b00c7ff6acd33123 : SUCCESS in 15m 47s