[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/17cdeef8d64a4290aa3311da4096f9... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/0faa9c133fa34b00a4cc6dbb354643c7 : SUCCESS in 3m 24s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/001737ae17394fb286d19c1475d7c623 : FAILURE in 2m 16s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/1871d024df30448ab909849181b971a8 : SUCCESS in 3m 30s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/38869448415c4b7cafe21e8cbfde3aca : FAILURE in 2m 39s