[Openstack-stable-maint] Stable check of openstack/tooz for ref refs/heads/stable/train failed

Build failed. - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/c0af3bd37edf43d0a21942baca4e5f03 : SUCCESS in 7m 20s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/4a08d47b4e3a419fbdf7f6ebdb483a59 : FAILURE in 6m 41s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/e02bfa55d12b48a789a54fbba79e4333 : FAILURE in 9m 28s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/9ffba3bd153b4e75b68fbd0d4e57430d : FAILURE in 9m 32s