[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/f31a211971de4313bff09fb44df544... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/fc6bd3aa94fe41d4b795c2b4c5aec4b9 : SUCCESS in 3m 10s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/a22fdf3c8df341ad835c6d1cff1e2434 : FAILURE in 2m 39s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c8314a0da8d4444c80e74c1ac08d78ca : SUCCESS in 2m 44s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/fb9586b14589435c884de9824d7af419 : FAILURE in 2m 58s