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

Build failed. https://zuul.opendev.org/t/openstack/buildset/03d6c3b29383490bbfebc1ca244977... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/190f081c1bd943ba87504c40a6c0416c : SUCCESS in 6m 43s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/b7b78fd7da34462b9b66c01590020952 : SUCCESS in 4m 40s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/7386f46adab64728b1dbfdd077b49401 : SUCCESS in 4m 53s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/1b06785f6a544acf89bea7e565eb6db9 : FAILURE in 3m 48s