Build failed. https://zuul.opendev.org/t/openstack/buildset/9a7d72d3295447a9a2a3aa0621f7203f - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/cc4bac9d8b414d3ab4d9d9b46411f0dc : SUCCESS in 3m 55s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/3d0932cc75594fdf8c4640fb9797a4d4 : SUCCESS in 2m 50s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/153a44790b2f48d180bcb7be619a47fb : SUCCESS in 3m 27s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/902a89dbb5634a3dbca033a57f64c35b : FAILURE in 2m 56s