[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/6b035bbd0f8f450890407cb535bed530 : SUCCESS in 7m 14s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/356c0fcbb8a04cef9505c086bf592f1a : FAILURE in 5m 01s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/973adc1e9da0414ca20dc5fd0d644a66 : FAILURE in 5m 48s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d900d91b7efc4d80b374d77a1372bb27 : FAILURE in 6m 35s