Build failed. https://zuul.opendev.org/t/openstack/buildset/0518c814f3d048c59f63d7fd9e5908d6 - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/7c30155492424a78964f40978ca0377f : SUCCESS in 3m 48s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/559abe99d4384dc7bab74ae790362088 : SUCCESS in 4m 46s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/8168d44e06f141c999aba473eb8fed0f : SUCCESS in 4m 43s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/84292fe23af1485790eec8a6b30b9e5d : FAILURE in 6m 40s