[Openstack-stable-maint] Stable check of openstack/nova for ref refs/heads/stable/train failed

Build failed. - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/fe7ac5087d3c4ab5a06a426f4649d5a5 : SUCCESS in 11m 45s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/ff931a8013964f18b0baf57d5ab0dc6f : FAILURE in 9m 32s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/27685c4ef11b4c5698255015bcc56b6a : SUCCESS in 18m 03s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5f4f705a083e4dabad9946529d3f0793 : SUCCESS in 25m 10s