[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/f434f8fb12954eb9a4504388e7f85440 : SUCCESS in 5m 36s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/eff251a7a15e43779930b70cb54706c2 : FAILURE in 6m 27s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0f300c1e3933410dae1ba49109762547 : FAILURE in 4m 53s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/9a5b49498ad740aa9d8f63f3d3e383c7 : FAILURE in 5m 58s