Revert closing of test web server back

We need completely different approach because it doesn't close child process

Author: nvborisenko

dotnet/test/common/Environment/TestWebServer.cs

@@ -150,8 +150,34 @@ public void Start()
 
         public void Stop()
         {
-            webserverProcess.Dispose();
-            webserverProcess = null;
+            HttpWebRequest request = WebRequest.Create(EnvironmentManager.Instance.UrlBuilder.LocalWhereIs("quitquitquit")) as HttpWebRequest;
+            try
+            {
+                request.GetResponse();
+            }
+            catch (WebException)
+            {
+            }
+
+            if (webserverProcess != null)
+            {
+                try
+                {
+                    webserverProcess.WaitForExit(10000);
+                    if (!webserverProcess.HasExited)
+                    {
+                        webserverProcess.Kill();
+                    }
+                }
+                catch (Exception)
+                {
+                }
+                finally
+                {
+                    webserverProcess.Dispose();
+                    webserverProcess = null;
+                }
+            }
         }
     }
 }