ApiCheck: Breaking change error message should include example exception JSON

[anpete]

To make adding exceptions easier.

[Tratcher]

@Eilon can we make this happen? The tool is very difficult to use without this.

The current error message I get is:

C:\Users\chrross\.nuget\packages\internal.aspnetcore.sdk\1.0.1-rc2-15212\build\ApiCheck.targets(19,5): error : ERROR: Missing type or member 'New members were added to the following interface => public interface Microsoft.AspNetCore.Hosting.Server.IServer : System.IDisposable' [C:\git\Universe\Hosting\src\Microsoft.AspNetCore.Hosting.Server.Abstractions\Microsoft.AspNetCore.Hosting.Server.Abstractions.csproj]

[Eilon]

Yeah I've seen a few people ask for this, I'll get an owner.

[Eilon]

@smitpatel please sync w/ @javiercn on how to do this.