[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/f61093b652ef45bfa754883f35136b30 : SUCCESS in 7m 14s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/e47b7cd5a68248549eed13846908fb98 : SUCCESS in 6m 01s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/058899fe191e423c95c5324df9504e26 : FAILURE in 4m 41s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d3a5f1a0ffdf45958b0c8fabebd02340 : SUCCESS in 5m 34s