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

Build failed. https://zuul.opendev.org/t/openstack/buildset/15e5ab48a39a4d31be272da67c456c... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/5e72bc9d6b204c058d29ca7f31501287 : SUCCESS in 8m 48s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/bf293d7a20284657a61f5a4e2c389907 : SUCCESS in 8m 52s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c9f805347e5840b1a4d0b84a86624d20 : SUCCESS in 7m 24s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/87f9a8841ece4ce5bf51c69528a5cf89 : FAILURE in 2m 42s