[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/138d68e413c74462a3662dac467f7038 : SUCCESS in 8m 34s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/18930702742f4e298b6c19a406b51e9f : FAILURE in 6m 21s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/91ddf97e1857440289a68fe925144a4b : FAILURE in 7m 49s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/2707451b86cc4817924233acd7f964e2 : FAILURE in 7m 26s