from collections import defaultdict
from nova.exception import ImageNotFound
from nova.api.ec2.cloud import CloudController
-from sfa.util.faults import SfaAPIError, SliverDoesNotExist
+from sfa.util.faults import SliverDoesNotExist
from sfa.util.sfatime import utcparse, datetime_to_string, datetime_to_epoch
from sfa.rspecs.rspec import RSpec
from sfa.rspecs.elements.hardware_type import HardwareType