Build failed. https://zuul.opendev.org/t/openstack/buildset/036f8f85b8d1457ab2038e28ed0380bb - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/e5468eaef4cd400caa7cd38b98f64033 : SUCCESS in 6m 30s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/89eeffe687b04abeaf93209daaf4bf36 : SUCCESS in 4m 21s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/f6dd2a4865f64d608dd037144e24899a : SUCCESS in 3m 32s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/368333166d54416b849231a386971ff3 : FAILURE in 4m 02s