[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/2ede148... : SUCCESS in 7m 29s - periodic-nova-python27-db-liberty http://logs.openstack.org/periodic-stable/periodic-nova-python27-db-liberty/... : FAILURE in 4m 37s - periodic-nova-docs-mitaka http://logs.openstack.org/periodic-stable/periodic-nova-docs-mitaka/70ad3c7/ : SUCCESS in 7m 17s - periodic-nova-python27-db-mitaka http://logs.openstack.org/periodic-stable/periodic-nova-python27-db-mitaka/a... : SUCCESS in 7m 40s