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.AcceptanceTests/StartupWithCustomCacheHandle.cs

@@ -0,0 +1,28 @@
+using CacheManager.Core;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using Ocelot.DependencyInjection;
+using Ocelot.AcceptanceTests.Caching;
+
+namespace Ocelot.AcceptanceTests
+{
+    public class StartupWithCustomCacheHandle : AcceptanceTestsStartup
+    {
+        public StartupWithCustomCacheHandle(IHostingEnvironment env) : base(env) { }
+
+        public override void ConfigureServices(IServiceCollection services)
+        {
+            services.AddOcelot(Configuration)
+                .AddCacheManager((x) =>
+                {
+                    x.WithMicrosoftLogging(log =>
+                    {
+                        log.AddConsole(LogLevel.Debug);
+                    })
+                    .WithJsonSerializer()
+                    .WithHandle(typeof(InMemoryJsonHandle<>));
+                });
+        }
+    }
+}