[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/32b7929b0941465d8ba606aef9cf23d7 : SUCCESS in 5m 48s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/f8b6aea04df44a2b88c77b0e034be08f : FAILURE in 6m 52s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c960a28e4a67460ea96a177ebc6af0c3 : FAILURE in 7m 03s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d90d3923f3724fbab45fb15153765b8e : FAILURE in 5m 58s