[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/525b6c7d19834f82acb91b7391a54b4b : SUCCESS in 8m 18s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/b400b728bd934c519f28fc899d476aae : FAILURE in 7m 36s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/b6d727cc0d78449b89e72b25a5e3a14c : FAILURE in 5m 21s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/042057c502cb4df5935b13e37dace211 : FAILURE in 9m 18s