[Openstack-stable-maint] Stable check of openstack/neutron-vpnaas failed

Build failed. - periodic-neutron-vpnaas-docs-kilo http://logs.openstack.org/periodic-stable/periodic-neutron-vpnaas-docs-kilo/... : SUCCESS in 6m 17s - periodic-neutron-vpnaas-python27-kilo http://logs.openstack.org/periodic-stable/periodic-neutron-vpnaas-python27-k... : UNSTABLE in 3m 03s - periodic-neutron-vpnaas-docs-liberty http://logs.openstack.org/periodic-stable/periodic-neutron-vpnaas-docs-liber... : SUCCESS in 2m 08s - periodic-neutron-vpnaas-python27-liberty http://logs.openstack.org/periodic-stable/periodic-neutron-vpnaas-python27-l... : UNSTABLE in 2m 25s