added tenantId/projectId to volume and snapshot

added tenant id to  volume and project id to snapshot
Hmm, I am not sure that we want to keep adding to the constructors for extension types. Is actually a `progress` field as well from the latest on [master](https://github.com/openstack/cinder/blob/master/cinder/api/contrib/extended_snapshot_attributes.py#L44).

Maybe extend Snapshot? `public class ExtendedSnapshot extends Snapshot`