[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/47b030093f39417283bae04c446e4ad2 : SUCCESS in 7m 51s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/36b968d5d02e4436b03fe4d2d0238e90 : FAILURE in 8m 17s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/b3f0843fc1c24c088efcf625cbcfefa9 : FAILURE in 6m 46s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/9840065358144f73ab5b473c3e253418 : FAILURE in 11m 10s