[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/e3b21a8c15584b3d97fc26ed542788... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/989bb76933684756881353075c19dada : SUCCESS in 3m 09s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/34986c7445924cf6be2abe4b6c3f43a4 : FAILURE in 3m 33s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/2b165c64910d42faa0b23c0fb9f1d756 : FAILURE in 3m 05s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8e22954f06e844c883664c91b6e25b41 : FAILURE in 3m 58s