Build failed. https://zuul.opendev.org/t/openstack/buildset/95a4f3f762ed413faf5f5f175f5557f2 - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/d6b0a97ef84c4d8bb72815b0b317fcef : SUCCESS in 4m 11s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/9bba167c0e8e44638189958e35a5aa4d : SUCCESS in 4m 39s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/afa54ce9ed264185a6019311c78959a8 : SUCCESS in 4m 26s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/7187d0463f5943b69c8c2fd5b69ffac1 : FAILURE in 4m 01s