devstack: use gnocchiclient to create default archive policies
devstack: use gnocchiclient to create default archive policies

Change-Id: I1b37ddc8fc36d94845ba876f2ff3b446d68bc72f

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