VTY: Don't welcome the user to the "control" interface, if it's VTY

This is quite confusing, I'm surprised that it has not been flagged
before...

Change-Id: I3dc07290579949891e481675d493e5a2ea6d0aed
diff --git a/src/vty/vty.c b/src/vty/vty.c
index e741a66..08258e7 100644
--- a/src/vty/vty.c
+++ b/src/vty/vty.c
@@ -362,7 +362,7 @@
 	if (host.app_info->name)
 		app_name = host.app_info->name;
 
-	vty_out(vty, "Welcome to the %s control interface%s%s",
+	vty_out(vty, "Welcome to the %s VTY interface%s%s",
 		app_name, VTY_NEWLINE, VTY_NEWLINE);
 
 	if (host.app_info->copyright)