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

Build failed. - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a6d5d9eb38c745c78f1878096f0bac0c : SUCCESS in 3m 50s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/ade11c6a51204da6a1c24cff0daf2750 : FAILURE in 4m 44s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/ed3a2b293b284bf2bfcf8927c296a3ca : SUCCESS in 4m 23s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f6a38813a6464805b29b3b22de8f9b05 : SUCCESS in 4m 17s