import akka.actor.PoisonPill;
import akka.actor.Props;
import akka.japi.Creator;
+import org.opendaylight.controller.cluster.common.actor.AbstractUntypedActor;
import org.opendaylight.controller.cluster.datastore.messages.CloseDataChangeListenerRegistration;
import org.opendaylight.controller.cluster.datastore.messages.CloseDataChangeListenerRegistrationReply;