Enable ServerTelemetryChannel in .net core by the default

[iusafaro]

Enable ServerTelemetryChannel in .net core by the default

[cijothomas]

Is there a reason of moving this line (using (var server = new InProcessServer(assemblyName))) from base class to each of the subclasses?

[iusafaro]

It was in base class only for dependencies, but for requests and exceptions, it was out of it in individual cases - i moved it out of here for dependencies as well to be more consistent in all methods.

[cijothomas]

Add changelog.md to indicate the new default channel.
Minor questions in comments as well.

1. Move the fake endpoint to a constant.
2. Is there a reason of moving this line (using (var server = new InProcessServer(assemblyName))) from base class to each of the subclasses?

[cijothomas]

Lets make this a constant.

[cijothomas]

Due to some reason build is not triggered automatically! Can you trigger one against this PR. ?

[SergeyKanzhelev]

LGTM

[cijothomas]

Please trigger 10-20 builds to confirm race condition test failures are resolved before merge.

[KEMBL]

Hello guys,

thank you for enabling of ServerTelemetryChannel in NETCOREAPP2_0, but how to access it now?

in non-Core it is possible like this:

	var channel = new Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel.ServerTelemetryChannel();
	channel.StorageFolder = "./CacheFolder/";
	channel.Initialize(TelemetryConfiguration.Active);

how to get the same in core?

[cijothomas]

@KEMBL
Can you open an GH issue, so that the question gets monitored.

Can you retrieve channel like this hostingEngine.Services.GetService()) ?