Build failed. https://zuul.opendev.org/t/openstack/buildset/be95b73aea0347679ce1c603b7d940f3 - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/82a09a4fd3884993b2d1a2c3b9af7018 : SUCCESS in 3m 53s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/ef5b5adedd4f45d58b4cc0d516966eae : SUCCESS in 7m 34s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/bf9aa4bc300b4b28944f3672d15326bb : SUCCESS in 4m 41s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f5fbe828440744bbbfb7acd0c5788717 : FAILURE in 4m 29s