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

Build failed. - periodic-nova-docs-liberty http://logs.openstack.org/periodic-stable/periodic-nova-docs-liberty/3a70077... : SUCCESS in 4m 26s - periodic-nova-python27-db-liberty http://logs.openstack.org/periodic-stable/periodic-nova-python27-db-liberty/... : FAILURE in 10m 17s - periodic-nova-docs-mitaka http://logs.openstack.org/periodic-stable/periodic-nova-docs-mitaka/3f8140b/ : SUCCESS in 4m 14s - periodic-nova-python27-db-mitaka http://logs.openstack.org/periodic-stable/periodic-nova-python27-db-mitaka/8... : SUCCESS in 9m 46s