[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/7b931366cdbe4c0e8b4b3dab27eccb... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/21af607b7a26471880d8346dd7ad5467 : SUCCESS in 3m 46s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/d7865c099cdb4b1d9688c2e4d3a5af98 : FAILURE in 2m 48s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/625a8e247b034cd8bb6d4ec1ac243b7d : SUCCESS in 2m 52s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/9ec660775697436d947433a0329e6837 : FAILURE in 2m 51s