'Finish reverting a resize/migration.
:param context: the context for the finish_revert_migration
:param instance: nova.objects.instance.Instance being migrated/resized
:param network_info: instance network information
:param block_device_info: instance volume block device info
:param power_on: True if the instance should be powered on, False
otherwise'

def finish_revert_migration(self, context, instance, network_info, block_device_info=None, power_on=True):

    raise NotImplementedError()
