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

Build failed. - periodic-ceilometer-docs-kilo http://logs.openstack.org/periodic-stable/periodic-ceilometer-docs-kilo/4c61... : SUCCESS in 7m 04s - periodic-ceilometer-python27-kilo http://logs.openstack.org/periodic-stable/periodic-ceilometer-python27-kilo/... : UNSTABLE in 10m 06s - periodic-ceilometer-docs-liberty http://logs.openstack.org/periodic-stable/periodic-ceilometer-docs-liberty/1... : SUCCESS in 6m 55s - periodic-ceilometer-python27-liberty http://logs.openstack.org/periodic-stable/periodic-ceilometer-python27-liber... : UNSTABLE in 6m 56s