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

Build failed. - periodic-ceilometer-docs-liberty http://logs.openstack.org/periodic-stable/periodic-ceilometer-docs-liberty/c... : SUCCESS in 6m 34s - periodic-ceilometer-python27-liberty http://logs.openstack.org/periodic-stable/periodic-ceilometer-python27-liber... : FAILURE in 7m 08s - periodic-ceilometer-docs-mitaka http://logs.openstack.org/periodic-stable/periodic-ceilometer-docs-mitaka/3f... : SUCCESS in 5m 59s - periodic-ceilometer-python27-mitaka http://logs.openstack.org/periodic-stable/periodic-ceilometer-python27-mitak... : SUCCESS in 6m 27s