Updating UdpReceiver SampleClientConfig with 127.0.0.1 so it works ou…

[janhebnes]

…t of the box on Windows 10 and added notice on remembering the appender-ref in the root section of log4net config

[Machete3000]

Does "localhost" not work out of the box on Windows 10?

[janhebnes]

I have experienced dead connections to localhost in the last three corporate environments i have worked in, with different networks and different dev machines. That all where resolved when specifying 127.0.0.1 directly. Removing the requirement to map localhost to 127.0.0.1 would have removed some hurdle i have had convincing dev colleagues of the out of box simplicity.