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

Build failed. https://zuul.opendev.org/t/openstack/buildset/edfc6dd9c901435b833e115f519d06... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/48e92708b0884f96ad3799ae571b52b2 : SUCCESS in 4m 07s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/18cb4664bf5a49fbbbee9c7a47b7d41f : SUCCESS in 4m 16s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/9eff0c9f0e0944b59891febb44ce1fa9 : SUCCESS in 3m 52s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5a846f9c1c2842cfbe686f26c2074725 : FAILURE in 3m 45s