[Openstack-stable-maint] Stable check of openstack/tooz for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/58bb28107c904c51b8f18cbe11a6ac... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/6236f44b8d534a649ef3399ebffa1807 : SUCCESS in 5m 04s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/65927726f2b34567bbf11d5500120f3c : SUCCESS in 6m 08s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/1d6dbd39aa994be18b52b68aa07941e1 : SUCCESS in 4m 33s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/516df65265e94fffa48c31eb7503c8f9 : FAILURE in 4m 18s