[Openstack-stable-maint] Stable check of openstack/futurist for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/9afa7fbbc2004e358561bd6cd4af9e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ad068dc373ed4d49acceca0256ecdb1a : SUCCESS in 3m 29s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/6384404d1180490a942c964e598f695c : SUCCESS in 4m 25s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/ae72aadd95064b86b02ae414e9ed0044 : SUCCESS in 3m 14s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f9258f64bc6e49cb97525f1d05331492 : FAILURE in 2m 39s