Build failed. https://zuul.opendev.org/t/openstack/buildset/7546263580b140f2b3790c4ed7a1e0f2 - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/158269d3e4e645c09c8fe9d62d8b1d7b : SUCCESS in 4m 36s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/c9830f268a1d48e5b08925e9d14c15a3 : SUCCESS in 4m 18s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/ac467b0e76d642fcaee186618c25872f : SUCCESS in 4m 47s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/4b1bd81101df47d392bc8af5e027ce54 : FAILURE in 4m 16s