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.ManualTest/appsettings.json

@@ -1,10 +1,10 @@
 {
   "Logging": {
-    "IncludeScopes": true,
+    "IncludeScopes": false,
     "LogLevel": {
-      "Default": "Trace",
-      "System": "Information",
-      "Microsoft": "Information"
+      "Default": "Debug",
+      "System": "Error",
+      "Microsoft": "Error"
     }
   }
 }