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

Build failed. - periodic-heat-docs-liberty http://logs.openstack.org/periodic-stable/periodic-heat-docs-liberty/be20cd6... : SUCCESS in 6m 32s - periodic-heat-python27-db-liberty http://logs.openstack.org/periodic-stable/periodic-heat-python27-db-liberty/... : FAILURE in 12m 36s - periodic-heat-docs-mitaka http://logs.openstack.org/periodic-stable/periodic-heat-docs-mitaka/c59df9a/ : SUCCESS in 7m 18s - periodic-heat-python27-db-mitaka http://logs.openstack.org/periodic-stable/periodic-heat-python27-db-mitaka/3... : SUCCESS in 13m 23s