Build failed. https://zuul.opendev.org/t/openstack/buildset/e8538c73ec4a4188a6c388cb18f3fe21 - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/6f9f0a974107412b8fb3f1cf6dd881d1 : SUCCESS in 3m 52s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/da7f74d8317b4e4faae8a82aeab6edd5 : SUCCESS in 5m 02s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/817c430679b943ec926cac79b74f585a : SUCCESS in 5m 01s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/53f5ff807f824c45945a32ae08c9ab32 : FAILURE in 4m 39s