- Added BaseHttpServer.Stop

- Added "register" command to MessagingServer to re-register with the
  UserServer after that crashed/was restarted.

OpenSim/Framework/Servers/BaseHttpServer.cs

@@ -1357,6 +1357,11 @@ namespace OpenSim.Framework.Servers
             }
         }
 
+        public void Stop()
+        {
+            m_httpListener2.Stop();
+        }
+
         public void RemoveStreamHandler(string httpMethod, string path)
         {
             string handlerKey = GetHandlerKey(httpMethod, path);