[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/d1001efe3a7044f28059d79cb4d385... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/db56da6a0ee3428a882a34154dd180d3 : SUCCESS in 3m 29s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/d4ba6b42d26e4cd4a00c0dc9bf7563af : FAILURE in 3m 42s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/28dfd22cd2ab44a190815be2664c3e72 : SUCCESS in 2m 59s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/2ce294c2e5cc4b5492722a73c4eec427 : FAILURE in 2m 55s