Build failed. https://zuul.opendev.org/t/openstack/buildset/b1492356f7d441c5b6e8288a5609da66 - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/be0f625874b042e28ef075b2d52554ba : SUCCESS in 3m 51s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/4a21cafca34a4d429f8fc1fd9e664ae7 : RETRY_LIMIT in 2m 40s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/1c5cdd9220eb494bafc00f880169412f : SUCCESS in 6m 31s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f7d304febded4bf8800a58b634f7d573 : FAILURE in 5m 15s