[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/f9270c53763a47a18e73f540aa1a92c8 : SUCCESS in 7m 17s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/97ac42dde4004e4cac559f197a1f18b4 : FAILURE in 6m 00s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/dd35493835024fdbb154fd300c756293 : FAILURE in 7m 31s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/aa9f4c7534854fedaf834d58fccacbcd : FAILURE in 8m 46s