Fix metricd TypeError's due to bad method signature
Fix metricd TypeError's due to bad method signature

Change-Id: I6052e5e2b8bd67bfd36f6f1dd1fbe752594bedf5
Closes-Bug: #1513604

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