close queues
close queues

metricd service catches SIGTERM and kills all children
multiprocessing handles. we can't detect queues at this step so
inspect the children and kill queues as required.

Change-Id: I226a0ba317ec4412159c2afa8f68895e00535e51

sileht/gnocchi,sileht/gnocchi,gnocchixyz/gnocchi,leandroreox/gnocchi,leandroreox/gnocchi,gnocchixyz/gnocchi