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

Build failed. https://zuul.opendev.org/t/openstack/buildset/3f2bc6ac900b4dac953d25cf45e6b7... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/f6fa68d8c4b24a38b3a4ba9087ae644f : FAILURE in 3m 27s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/efcf8ac8bb6d460f80da1b86fddb2144 : FAILURE in 3m 17s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/86fcf7c6fa224f199daaafd983dc1fb3 : FAILURE in 4m 28s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/50d399d604c8452b8e93b77adce43816 : FAILURE in 2m 48s