_carbonara: fix futures import
_carbonara: fix futures import

This method is deprecated.

Change-Id: Ic09cd51dbc03c8acec76878b66758ed3363d0019

sileht/gnocchi,idegtiarov/gnocchi-rep,leandroreox/gnocchi,sileht/gnocchi,gnocchixyz/gnocchi,idegtiarov/gnocchi-rep,gnocchixyz/gnocchi,leandroreox/gnocchi,idegtiarov/gnocchi-rep