[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/07aefaf525e84b98aed3df278c314b... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ce895aae28f34f5c904d4dc8327fe850 : SUCCESS in 3m 14s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/6a18b0789aa54eb696d8680694d6ca28 : FAILURE in 3m 31s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/83e64add573a4390ba069cdebf6a8dc7 : SUCCESS in 3m 18s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/4c8d5e33dd9c4a5db457ac5b07261f0c : FAILURE in 4m 57s