Implement optional name and description on http stream handlers so that we can relate a slow request to what the handler actually does and the agent it serves, if applicable.

This is most useful for capabilities where the url is not self-describing.

OpenSim/Region/ClientStack/Linden/Caps/WebFetchInvDescModule.cs

@@ -144,7 +144,12 @@ namespace OpenSim.Region.ClientStack.Linden
                 capUrl = "/CAPS/" + UUID.Random();
 
                 IRequestHandler reqHandler
-                    = new RestStreamHandler("POST", capUrl, m_webFetchHandler.FetchInventoryDescendentsRequest);
+                    = new RestStreamHandler(
+                        "POST",
+                        capUrl,
+                        m_webFetchHandler.FetchInventoryDescendentsRequest,
+                        "FetchInventoryDescendents2",
+                        agentID.ToString());
 
                 caps.RegisterHandler(capName, reqHandler);
             }
@@ -160,4 +165,4 @@ namespace OpenSim.Region.ClientStack.Linden
 //                capName, capUrl, m_scene.RegionInfo.RegionName, agentID);
         }
     }
-}
+}