Build failed. https://zuul.opendev.org/t/openstack/buildset/4139813b31b04f4d927cf58c923f54f8 - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/935cf00832a34604ba80c3ca4f2a97af : SUCCESS in 4m 43s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/e87e89a1ecd94f0fbc0eb712e45928b3 : SUCCESS in 4m 47s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/5cf3d8e1cfb0483e9b294f541fcf843a : SUCCESS in 4m 59s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/46baeea9af5144fda428e6872755860e : FAILURE in 4m 06s