Explictly close down the StatsReporter so that we can shutdown its timer

This is another step necessary for the scene to be garbage collected between performance tests

OpenSim/Region/Framework/Scenes/Scene.cs

@@ -1076,6 +1076,8 @@ namespace OpenSim.Region.Framework.Scenes
         {
             m_log.InfoFormat("[SCENE]: Closing down the single simulator: {0}", RegionInfo.RegionName);
 
+            StatsReporter.Close();
+
             m_restartTimer.Stop();
             m_restartTimer.Close();
 

OpenSim/Region/Framework/Scenes/SimStatsReporter.cs

@@ -185,6 +185,12 @@ namespace OpenSim.Region.Framework.Scenes
                 OnSendStatsResult += StatsManager.SimExtraStats.ReceiveClassicSimStatsPacket;
         }
 
+        public void Close()
+        {
+            m_report.Elapsed -= statsHeartBeat;
+            m_report.Close();
+        }
+
         public void SetUpdateMS(int ms)
         {
             statsUpdatesEveryMS = ms;