Add request received/handling stats for caps which are served by http poll handlers.

This adds explicit cap poll handler supporting to the Caps classes rather than relying on callers to do the complicated coding.
Other refactoring was required to get logic into the right places to support this.

OpenSim/Framework/Servers/HttpServer/PollServiceHttpRequest.cs

@@ -26,13 +26,19 @@
  */
 
 using System;
+using System.Collections;
+using System.Reflection;
+using System.Text;
 using HttpServer;
+using log4net;
 using OpenMetaverse;
 
 namespace OpenSim.Framework.Servers.HttpServer
 {
     public class PollServiceHttpRequest
     {
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
         public readonly PollServiceEventArgs PollServiceArgs;
         public readonly IHttpClientContext HttpContext;
         public readonly IHttpRequest Request;
@@ -48,5 +54,44 @@ namespace OpenSim.Framework.Servers.HttpServer
             RequestTime = System.Environment.TickCount;
             RequestID = UUID.Random();
         }
+
+        internal void DoHTTPGruntWork(BaseHttpServer server, Hashtable responsedata)
+        {
+            OSHttpResponse response
+                = new OSHttpResponse(new HttpResponse(HttpContext, Request), HttpContext);
+
+            byte[] buffer = server.DoHTTPGruntWork(responsedata, response);
+
+            response.SendChunked = false;
+            response.ContentLength64 = buffer.Length;
+            response.ContentEncoding = Encoding.UTF8;
+
+            try
+            {
+                response.OutputStream.Write(buffer, 0, buffer.Length);
+            }
+            catch (Exception ex)
+            {
+                m_log.Warn(string.Format("[POLL SERVICE WORKER THREAD]: Error ", ex));
+            }
+            finally
+            {
+                //response.OutputStream.Close();
+                try
+                {
+                    response.OutputStream.Flush();
+                    response.Send();
+
+                    //if (!response.KeepAlive && response.ReuseContext)
+                    //    response.FreeContext();
+                }
+                catch (Exception e)
+                {
+                    m_log.Warn(String.Format("[POLL SERVICE WORKER THREAD]: Error ", e));
+                }
+
+                PollServiceArgs.RequestsHandled++;
+            }
+        }
     }
 }