ceph: fix python3 issue
ceph: fix python3 issue

Change-Id: I089f15e085780eab236a1c57810cbf6645e07d42

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