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

Build failed. - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/6e36e1a28e7c4d1399fe46764a7a3ff9 : SUCCESS in 16m 16s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/c600ca7d1af2465d817739beefda6f80 : FAILURE in 29m 19s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/4349e201525b4086b307cbec13f7fb17 : SUCCESS in 25m 37s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/c7419474c13242c283989d5d922fac16 : SUCCESS in 21m 08s