[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/40f7d1efbf5d45c1a0689a8a1e6ed8a6 : SUCCESS in 7m 03s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/947c97cd34ad4591a15ae7a97fbaa4ea : FAILURE in 6m 04s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/6e349dbc3fce42118d09ad334e669cfd : FAILURE in 7m 14s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/955ae166ddb2449db9abeb107d56a122 : FAILURE in 6m 02s