[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/57cd343be24c4886859cfd99a949db6c : SUCCESS in 6m 21s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/26c83ee340a6496391483d783029a553 : FAILURE in 4m 54s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/ebcde0f4d328406ea616058d293c0ee3 : FAILURE in 5m 16s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/e0ee324391d4415ebf33d37ad458def1 : FAILURE in 7m 22s