import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.entityTypeEntryWithEntityEntry;
import akka.actor.ActorRef;
-import com.google.common.base.Optional;
import com.google.common.collect.Sets;
import java.util.Collection;
+import java.util.Optional;
import java.util.concurrent.TimeUnit;
import org.junit.After;
import org.junit.Before;