[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/c1213b8a86ca4e1399c319cca57239... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/bf16d868303c460b9c71fd41dbcf01bb : SUCCESS in 3m 27s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/aefa430069b94c52a2623daed56118a8 : FAILURE in 2m 58s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/3ba52807d2e8431bb7d413df72b91b09 : SUCCESS in 2m 51s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/02690a7185db431f9b9b769bcbed6ab9 : FAILURE in 2m 45s