Improving logging and request id (#189)

* hacking around to work out why logging and request id isnt working

* pass request id into logger so it can be structured, removed a bunch of debug logging we dont need because diagnostic trace gets it

* changed config dependency

* always have tracing available

* made it so we dont need to pass config into services.AddOcelot anymore with .net core 2.0

* add test

* lots of changes relating to logging and request ids, also updated documentation

* fixed failing test i missed

test/Ocelot.UnitTests/Configuration/InMemoryConfigurationRepositoryTests.cs

@@ -94,6 +94,8 @@ namespace Ocelot.UnitTests.Configuration
             public string AdministrationPath {get;}
 
             public ServiceProviderConfiguration ServiceProviderConfiguration => throw new NotImplementedException();
+
+            public string RequestId {get;}
         }
     }
 }