[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/83606f7476334de59042468334727947 : SUCCESS in 5m 52s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/4e3120217b5d4cfcaa9bb1b72bef42c9 : FAILURE in 4m 36s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0e141f7258bd4102bdbb6618a98de5c5 : FAILURE in 4m 52s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a307fe24e2964ce7b7ad321319d121a2 : FAILURE in 6m 08s