[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/2ca0b8415e7147ffac48e8ae92d4882c : SUCCESS in 6m 15s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/7541e341f18a4d4faeba3ddd020cbc66 : FAILURE in 4m 58s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c0e061145d5349d6af9dc77d70376449 : FAILURE in 5m 24s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/81fdd865eb7645f3afaa3577e5d08a87 : FAILURE in 5m 45s