cosmetic: hnbgw: addr related renames, move define, move comment

Prepare for parameterization of IuCS and IuPS addresses:

Conform internal variable naming to local-ip, local-port, remote-ip,
remote-port (instead of bind-ip).

Rename HNBGW_IUH_LOCAL_IP_DEFAULT to HNGGW_LOCAL_IP_DEFAULT to be more general
and move it to the top.

Move a function doc comment to the .c file.

Change-Id: Ice85941c978498e3ddf41d151248507e7f56cb5d
diff --git a/src/hnbgw_vty.c b/src/hnbgw_vty.c
index 5dee41a..93c1f9a 100644
--- a/src/hnbgw_vty.c
+++ b/src/hnbgw_vty.c
@@ -107,10 +107,10 @@
 
 DEFUN(cfg_hnbgw_iuh_local_ip, cfg_hnbgw_iuh_local_ip_cmd, "local-ip A.B.C.D",
       "Accept Iuh connections on local interface\n"
-      "Local interface IP address (default: " HNBGW_IUH_LOCAL_IP_DEFAULT ")")
+      "Local interface IP address (default: " HNBGW_LOCAL_IP_DEFAULT ")")
 {
-	talloc_free((void*)g_hnb_gw->config.iuh_bind_addr);
-	g_hnb_gw->config.iuh_bind_addr = talloc_strdup(tall_hnb_ctx, argv[0]);
+	talloc_free((void*)g_hnb_gw->config.iuh_local_ip);
+	g_hnb_gw->config.iuh_local_ip = talloc_strdup(tall_hnb_ctx, argv[0]);
 	return CMD_SUCCESS;
 }
 
@@ -136,8 +136,8 @@
 
 	vty_out(vty, " iuh%s", VTY_NEWLINE);
 
-	addr = g_hnb_gw->config.iuh_bind_addr;
-	if (addr && (strcmp(addr, HNBGW_IUH_LOCAL_IP_DEFAULT) != 0))
+	addr = g_hnb_gw->config.iuh_local_ip;
+	if (addr && (strcmp(addr, HNBGW_LOCAL_IP_DEFAULT) != 0))
 		vty_out(vty, "  local-ip %s%s", addr, VTY_NEWLINE);
 
 	if (g_hnb_gw->config.hnbap_allow_tmsi)