When killing a zombie session, don't send the stop packet since it often has the effect of killing a newly connected client.

OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs

@@ -884,6 +884,11 @@ namespace OpenSim.Region.OptionalModules.Agent.InternetRelayClientView.Server
         }
 
         public void Close()
+        {
+            Close(true);
+        }
+
+        public void Close(bool sendStop)
         {
             Disconnect();
         }