[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/0f3cf31e31e5445e82cf97920bf996... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/5c9c84ae66fd4790a563b0ebc1fbeaa7 : SUCCESS in 4m 55s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/12b96a26febd4089a51a0cb6988e27cc : FAILURE in 4m 29s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/a139b44df0fa41e584bdb93c654e8a3a : SUCCESS in 3m 22s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/e9aa1e8acad642a89e867139f867e92e : FAILURE in 2m 53s