[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/bbfd44eb2fbd4adb948f390dbda4dc13 : SUCCESS in 6m 39s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/7a516839b18e477fa27c39be25ea2741 : FAILURE in 6m 39s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/b14a76a51cab429494b3d4edcd47163b : FAILURE in 6m 39s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5a6bcce422774fdd8679d863bdd00b35 : FAILURE in 6m 38s