[Openstack-stable-maint] Stable check of openstack/tooz for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/d1ddce2e0eb44cbfb2ea0bf49f8861... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/46616cd40dd045e5997313d7c364e176 : SUCCESS in 6m 39s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/f7a7a36def254124b36a9f1bfce0e7c3 : SUCCESS in 7m 37s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/04dc3eeccf5845f1b9ef974f573748da : SUCCESS in 5m 17s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/c3b14df1de104d389bde201ce35718bc : FAILURE in 4m 07s