use threads from main pool on assetsconnector

OpenSim/Framework/Util.cs

@@ -2579,7 +2579,6 @@ namespace OpenSim.Framework
                     }
                     catch (ThreadAbortException e)
                     {
-                        m_log.Error(string.Format("Aborted threadfunc {0} ", threadFuncNum), e);
                     }
                     catch (Exception e)
                     {

OpenSim/Services/Connectors/Asset/AssetServicesConnector.cs

@@ -135,9 +135,7 @@ namespace OpenSim.Services.Connectors
 
             for (int i = 0 ; i < 2 ; i++)
             {
-                m_fetchThreads[i] = new Thread(AssetRequestProcessor);
-                m_fetchThreads[i].IsBackground = true;
-                m_fetchThreads[i].Start();
+                Util.FireAndForget(delegate { AssetRequestProcessor();});
             }
         }