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

Build failed. https://zuul.opendev.org/t/openstack/buildset/332dfee4600841e5abb8fd42a3f0a6... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/80261f82fc6344f3b1795bce45eece92 : SUCCESS in 5m 02s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/642d91b567ee4d4fa501866a9b387c8e : SUCCESS in 7m 01s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/41b3f92fc31047c38164f0a050af9a8f : SUCCESS in 4m 09s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/de4f78994add415cb9be3d6c698523c8 : FAILURE in 3m 42s