[Openstack-stable-maint] Stable check of openstack/neutron-vpnaas for ref refs/heads/stable/yoga failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/e999a33d0dfa4725939023431ae0f2... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/0a4332b4346c4bf5b917360aa0f53d37 : POST_FAILURE in 19m 59s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/540e76b4e1964079836b48637dfb56b2 : SUCCESS in 7m 04s - openstack-tox-py38 https://zuul.opendev.org/t/openstack/build/2ca799f7af054c52b589a9b8c29c8c6e : SUCCESS in 5m 45s