[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/0285d1869b244755bac42aae0378c01c : SUCCESS in 7m 11s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/3d318f738d9b4322aec301bd81143d07 : FAILURE in 7m 02s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/787cb3c50c2f40c299f194dfe2beda9c : FAILURE in 5m 39s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/19e7d45d50974c3486cd18fef971a38e : FAILURE in 7m 21s