db: Rename AuthTuples to AuthLastTuples

Ultimately, we'll need to store both the last used tuple by a
subscriber and a list of known tuples (for unknown Ki). What's
currently implemented for AuthTuples is the former behavior, so
reflect that.

The second use case will be added as a separate table with separate
accessors later on.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/openbsc/src/vty_interface_layer3.c b/openbsc/src/vty_interface_layer3.c
index 807e165..0b6da04 100644
--- a/openbsc/src/vty_interface_layer3.c
+++ b/openbsc/src/vty_interface_layer3.c
@@ -100,7 +100,7 @@
 			VTY_NEWLINE);
 	}
 
-	rc = get_authtuple_by_subscr(&atuple, subscr);
+	rc = get_lastauthtuple_by_subscr(&atuple, subscr);
 	if (!rc) {
 		vty_out(vty, "    A3A8 last tuple (used %d times):%s",
 			atuple.use_count, VTY_NEWLINE);