[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/4cbabd8ad97a415a95e87c47c5cb0d10 : SUCCESS in 7m 35s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/070dee19da0a41f2bb442fc4917b1f0d : FAILURE in 6m 18s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/7cdb788443d7405f8f91eed7ec58857c : FAILURE in 7m 16s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/0ca95d01895c454387154f9745d4b08f : FAILURE in 6m 12s