[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/72a3a83ba5684409b39082efca1db963 : SUCCESS in 7m 48s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/460e07684bfa4147800669beb6700a0a : FAILURE in 7m 51s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d14c659310d749d0a110aa305e9073f4 : FAILURE in 7m 55s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/4f33918d49dc4f869650c8bdc9ee2f02 : FAILURE in 8m 34s