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

Build failed. https://zuul.opendev.org/t/openstack/buildset/f4b45559925847f686f042e8b7ac37... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/18d5de9e00be408685e6f71b4b04ad46 : SUCCESS in 4m 11s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/02ec1d484cfc4c74acfcbab68d2dfdf5 : SUCCESS in 3m 41s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/a16f41cf2ae94ad4a752980e6a412a09 : SUCCESS in 4m 21s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a0ffe5ae77824ae4864f39794e63c6a0 : FAILURE in 3m 08s