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

Build failed. https://zuul.opendev.org/t/openstack/buildset/c245e4f74c7747c0af234892f13251... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/4c34289ff63f4b228196be68064a7442 : SUCCESS in 3m 22s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/cc63ce27b8fc407887db735d154d1c6c : SUCCESS in 4m 19s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/5510c2d2e57549259676b51e3bde8e97 : SUCCESS in 4m 26s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5c6c33a4ae8d4abdabcd0e4d5adb6da1 : FAILURE in 4m 02s