* Stop creating a circuit if the client fails authentication (i.e. the region server wasn't told that it was coming)

* This moves authentication from the client thread (where failure was difficult to detect) to the particular thread handling that packet
* I've kept the authentication outside of the crucial clientCircuits lock (though any delay here is probably swamped by the other delays associated with login)
* Also added more to the unit test to ensure this doesn't regress

OpenSim/Framework/AgentCircuitManager.cs

@@ -63,6 +63,7 @@ namespace OpenSim.Framework
                 user.LoginInfo.Last = validcircuit.lastname;
                 user.LoginInfo.InventoryFolder = validcircuit.InventoryFolder;
                 user.LoginInfo.BaseFolder = validcircuit.BaseFolder;
+                user.LoginInfo.StartPos = validcircuit.startpos;
             }
             else
             {