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

Build failed. https://zuul.opendev.org/t/openstack/buildset/3fddf65d8b9e464385288ad0413744... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/76a1684dadc14faa89d5b0b8536c5a44 : SUCCESS in 10m 51s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/34b2bcacee374d2ca34b568e996ed57a : SUCCESS in 13m 24s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/147ea80b5e0d43d8ab2d9ad36c09cd5e : FAILURE in 16m 33s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a1fed4088da14bc8bed291c6a025f7e7 : SUCCESS in 13m 47s