Java NetworkTable: Don't use ipAddress when starting server.

This matches the C++ behavior.  Using the IP address here is confusing to
users because it's actually the listen address.

java/src/edu/wpi/first/wpilibj/networktables/NetworkTable.java

@@ -41,7 +41,7 @@ public class NetworkTable implements ITable, IRemote {
     if (client)
       NetworkTablesJNI.startClient(ipAddress, port);
     else
-      NetworkTablesJNI.startServer(persistentFilename, ipAddress, port);
+      NetworkTablesJNI.startServer(persistentFilename, "", port);
     running = true;
   }