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

Build failed. https://zuul.opendev.org/t/openstack/buildset/1b26e32565304adbbd3cc5e57ab635... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/79523db793bf40539816573827121edd : SUCCESS in 14m 14s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/7dca43224bbf4bc0a353e1f6274f0cae : SUCCESS in 11m 54s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/ac140cac844b4e25af92e5994d21e3fb : FAILURE in 14m 13s