Raft round 2 (#182)

* brought in rafty

* moved raft classes into Ocelot and deleted from int project

* started to set up rafty in Ocelot

* RAFTY INSIDE OCELOT...WOOT

* more work adding rafty...just need to get auth working now

* rudimentary authenticated raft requests working

* asyn await stuff

* hacked rafty into the fileconfigurationcontroller...everything seems to be working roughly but I have a lot of refactoring to do

* updated to latest rafty that doesnt need an id

* hacky but all tests passing

* changed admin area set up to use builder not configuration.json, changed admin area auth to use client credentials

* missing code coverage

* ignore raft sectionf for code coverage

* ignore raft sectionf for code coverage

* back to normal filters

* try exclude attr

* missed these

* moved client secret to builder for authentication and updated docs

* lock to try and fix error accessing identity server created temprsa file on build server

* updated postman scripts and changed Ocelot to not always use type handling as this looked crap when manually accessing the configuration endpoint

* added rafty docs

* changes I missed

* added serialisation code we need for rafty to process commands when they proxy to leader

* moved controllers into their feature slices

test/Ocelot.UnitTests/Controllers/OutputCacheControllerTests.cs

@@ -1,10 +1,9 @@
 using Xunit;
 using Shouldly;
 using TestStack.BDDfy;
-using Ocelot.Controllers;
+using Ocelot.Cache;
 using System;
 using Moq;
-using Ocelot.Cache;
 using System.Net.Http;
 using System.Collections.Generic;
 using Microsoft.AspNetCore.Mvc;