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

Build failed. https://zuul.opendev.org/t/openstack/buildset/b67143cad4c044a3958b761235ff16... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/cfaf1c3ee69c485db4413650bdf5ebb2 : FAILURE in 2m 35s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/c8e1e34f75ee465c9d620c488f869ef3 : FAILURE in 3m 09s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/44b202206eee4f9e9c5d480ece492ca1 : FAILURE in 2m 40s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d110d0cb60be46b1b6d1cdc887950a76 : FAILURE in 3m 48s