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

Build failed. https://zuul.opendev.org/t/openstack/buildset/3108b283314f46fa91138e96caa277... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/d170d35e856c40d9933393d108f4a66f : SUCCESS in 4m 14s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/ea6275d126aa411e9dbcf6ad923b4772 : SUCCESS in 4m 14s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/013fa4b3a4254b35a2bbe13f8de73e04 : SUCCESS in 3m 41s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/57604388e2fd4f4785dab4d0094799fa : FAILURE in 3m 49s