make telnet interface use VTY code

diff --git a/include/openbsc/telnet_interface.h b/include/openbsc/telnet_interface.h
index 228b623..b5a0ec4 100644
--- a/include/openbsc/telnet_interface.h
+++ b/include/openbsc/telnet_interface.h
@@ -25,6 +25,8 @@
 #include "linuxlist.h"
 #include "select.h"
 
+#include <vty/vty.h>
+
 #define TELNET_COMMAND_48	1
 #define TELNET_COMMAND_11	2
 
@@ -32,6 +34,8 @@
 	struct llist_head entry;
 	struct gsm_network *network;
 	struct bsc_fd fd;
+	struct vty *vty;
+
 	int bts;
 
 	int command;