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
If there are other parameters before the VarArg parameter, then the numbers after the VarArg parameters will not start at 0. For example, see the `String.Join` node.