[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/ee15ed7e0771407dbc0adb5dfcb3f805 : SUCCESS in 6m 18s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/059e9315d7724f959d55ee821c9d65c5 : FAILURE in 6m 40s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c90e11a73dbc49aa8d395fe197601cde : FAILURE in 7m 35s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/912b4e5245a344d0978970a79149e609 : FAILURE in 6m 33s