Move reverse connection information into VNCSConnectionST

The only class that cares if connections are reversed or not is
VNCSConnectionST so let it keep track of this fact.
diff --git a/common/rfb/VNCSConnectionST.h b/common/rfb/VNCSConnectionST.h
index 7b25570..978879f 100644
--- a/common/rfb/VNCSConnectionST.h
+++ b/common/rfb/VNCSConnectionST.h
@@ -173,6 +173,7 @@
 
     network::Socket* sock;
     CharArray peerEndpoint;
+    bool reverseConnection;
 
     Timer queryConnectTimer;