Fixed Issue MAGN4944

Issue: http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-4944
Addded 1 in-port to nodes from DSVarArgFunction
@Steell  Please review it. Thanks
I think just doing `var argName = arg.Name.Remove(arg.Name.Length - 1) + "1";` will do the trick.