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

Build failed. https://zuul.opendev.org/t/openstack/buildset/8807db438cc346318f586641129f21... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/aed5b2a32ef94bb196322ff62ddbe640 : SUCCESS in 3m 06s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/53a2e858d7e64d61b68d09ed703f3ccb : FAILURE in 2m 23s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/8b0e93c080fe417bb1ec3e97365bf32a : SUCCESS in 3m 06s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/ed7d3a904b714b2494758780ce732851 : SUCCESS in 3m 11s