[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/9822f80597344495a27a1d84a15ad363 : SUCCESS in 5m 31s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/dcc6836e3d00489686db0baa65970e3b : FAILURE in 5m 35s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/8ed0af3fd2654d619f224249901b8e43 : FAILURE in 6m 38s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/90f0d4d1236f48b39e511c78e000fcbc : FAILURE in 4m 58s