Revert "Added request.Proxy=null everywhere, as discussed in http://stackoverflow.com/questions/2519655/httpwebrequest-is-extremely-slow."

But the patch is here, in case anyone wants to try it.

This reverts commit 531edd51d8.

OpenSim/Framework/Configuration/HTTP/HTTPConfiguration.cs

@@ -65,7 +65,6 @@ namespace OpenSim.Framework.Configuration.HTTP
                 byte[] buf = new byte[8192];
                 HttpWebRequest request =
                     (HttpWebRequest) WebRequest.Create(remoteConfigSettings.baseConfigURL + configFileName);
-                request.Proxy = null;
                 HttpWebResponse response = (HttpWebResponse) request.GetResponse();
 
                 Stream resStream = response.GetResponseStream();