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
@Steell As my thinking, the situation that we got a function with 2 params wont never happen. C# does not allow us to do so, I think. And for now, I dont think we need any function with 2 params.