[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/b194fb60900e4a67808c9909c3c0201f : SUCCESS in 5m 42s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/1b7c61266b2f49848eb77011250f3ab0 : FAILURE in 5m 54s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/416565975b49453aaf3465843e0b12c6 : FAILURE in 6m 29s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/1348f3a529344ad38775501c98bee34e : FAILURE in 8m 13s