[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/ae7f2452e35d4b1a8272f3bca6b78542 : SUCCESS in 7m 34s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/6b606e2eaa4b4780a7431fc73cc4de79 : FAILURE in 4m 24s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/89f861ca8121487f87f571e197455cd4 : FAILURE in 4m 50s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/616b7bc41ba8492e9f6e872f64a7eacb : FAILURE in 4m 34s