[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/42e1a036467f4fca9201dcb2057086... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/9557da73a77341dc86dd02f175c8ede3 : SUCCESS in 4m 41s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/5a604992b97d42f985f07ffa3ed1f9e9 : FAILURE in 6m 32s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/1ad50908ee4f487485cde2bc1a5e29d2 : SUCCESS in 3m 40s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f01d72c8001844339e53e7828697cd14 : FAILURE in 3m 34s