[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/c68d05ec1e214a8e92f57c75014e9aa4 : SUCCESS in 6m 29s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/73cb49ec21be4b5998cf39de590b444a : FAILURE in 6m 09s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/ca4556919e6a4912ac1af75b3150b7fa : FAILURE in 6m 48s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/b4bd23b518f9443898f49e7fdc04ca00 : FAILURE in 8m 07s