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/Region/OptionalModules/Avatar/Concierge/ConciergeModule.cs

@@ -386,7 +386,7 @@ namespace OpenSim.Region.OptionalModules.Avatar.Concierge
             updatePost.ContentType = "text/xml";
             updatePost.ContentLength = payload.Length;
             updatePost.UserAgent = "OpenSim.Concierge";
-            updatePost.Proxy = null;
+
 
             BrokerState bs = new BrokerState(uri, payload, updatePost);
             bs.Timer = new Timer(delegate(object state)

OpenSim/Region/OptionalModules/Avatar/Voice/FreeSwitchVoice/FreeSwitchVoiceModule.cs

@@ -541,7 +541,6 @@ namespace OpenSim.Region.OptionalModules.Avatar.Voice.FreeSwitchVoice
             forwardreq.Method = method;
             forwardreq.ContentType = contenttype;
             forwardreq.KeepAlive = false;
-            forwardreq.Proxy = null;
 
             if (method == "POST")
             {

OpenSim/Region/OptionalModules/Avatar/Voice/VivoxVoice/VivoxVoiceModule.cs

@@ -1119,7 +1119,6 @@ namespace OpenSim.Region.OptionalModules.Avatar.Voice.VivoxVoice
 
                 // We are sending just parameters, no content
                 req.ContentLength = 0;
-                req.Proxy = null;
 
                 // Send request and retrieve the response
                 rsp = (HttpWebResponse)req.GetResponse();

OpenSim/Region/OptionalModules/Avatar/XmlRpcGroups/XmlRpcGroupsServicesConnectorModule.cs

@@ -1150,7 +1150,6 @@ namespace Nwc.XmlRpc
             request.ContentType = "text/xml";
             request.AllowWriteStreamBuffering = true;
             request.KeepAlive = !_disableKeepAlive;
-            request.Proxy = null;
 
             Stream stream = request.GetRequestStream();
             XmlTextWriter xml = new XmlTextWriter(stream, Encoding.ASCII);

OpenSim/Region/OptionalModules/Scripting/RegionReadyModule/RegionReadyModule.cs

@@ -280,7 +280,6 @@ namespace OpenSim.Region.OptionalModules.Scripting.RegionReady
             WebRequest request = WebRequest.Create(m_uri);
             request.Method = request_method;
             request.ContentType = content_type;
-            request.Proxy = null;
 
             Stream os = null;
             try