[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/cd278a444f124da681b4f0331fd9a559 : SUCCESS in 7m 28s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/92f997e838eb40f1b738ed1bc0ad147c : FAILURE in 7m 45s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/24e9a4ff361c49bebe547d0c5e3d2e16 : FAILURE in 8m 24s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/e0ed0cb8fcfc401fb55252bbffff8a43 : FAILURE in 8m 30s