Fix where the test http server serves files from, doh

Author: shana

src/tests/IntegrationTests/Download/DownloadTaskTests.cs

@@ -26,7 +26,7 @@ public override void OnSetup()
         public override void TestFixtureSetUp()
         {
             base.TestFixtureSetUp();
-            server = new TestWebServer.HttpServer();
+            server = new TestWebServer.HttpServer(SolutionDirectory.Combine("files"));
             Task.Factory.StartNew(server.Start);
             ApplicationConfiguration.WebTimeout = 20000;
         }

src/tests/TestWebServer/HttpServer.cs

@@ -67,7 +67,7 @@ public void Start()
         {
             try
             {
-                Logger.Info($"Starting http server on port {Port}");
+                Logger.Info($"Starting http server on port {Port} serving from {rootDirectory}");
                 listener.Start();
                 while (true)
                 {