[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/73b7860ce26347bd8ffbb27c4ef9d681 : SUCCESS in 7m 07s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/cea84a147058429387d2cbc629b77fdf : FAILURE in 6m 13s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/ff0152a9d3d1454bb48f68b0675d1548 : FAILURE in 7m 52s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/cd3cee5630234b2bac68d1dd19f7694b : FAILURE in 8m 08s