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

Build failed. https://zuul.opendev.org/t/openstack/buildset/ec83d9c17a2f46c89f8b4fd6d571e9... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/b635437c25bf441aa4e1234bed32a393 : SUCCESS in 3m 08s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/ea645f6e296a4da998b6377bbf672ebb : FAILURE in 2m 34s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/30477c2eaf93405ebb76bc3fdcd4062e : SUCCESS in 2m 23s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f5dbaebb402a42bf98ca37ca45906dcc : FAILURE in 2m 47s