hnbgw: vty conformance: rename iuh 'bind' command to 'local-ip'

The standard osmo VTY terminology is 'remote-ip', 'remote-port', 'local-ip',
'local-port'. Conform to that. osmo-hnbgw is so far not rolled out widely, so
it makes sense to do this now.

Change-Id: Ifda2653bf58044552a5f1477cd7008dec3fb9100
diff --git a/src/hnbgw.c b/src/hnbgw.c
index bd0b3ba..500cf0f 100644
--- a/src/hnbgw.c
+++ b/src/hnbgw.c
@@ -312,7 +312,7 @@
 {
 	const char *addr = gw->config.iuh_bind_addr;
 	if (!addr)
-		addr = HNBGW_IUH_BIND_ADDR_DEFAULT;
+		addr = HNBGW_IUH_LOCAL_IP_DEFAULT;
 	return addr;
 }