mgcp: add VTY Option to force-realloc endpoints

Currently the force_realloc feature is turnd on and of in a
hardcoded way. This patch makes the option available via VTY.

Change-Id: Ic8740512c5ea0766ff6ceb1c28b9c2b3fe46e75f
diff --git a/src/osmo-bsc_nat/bsc_nat.c b/src/osmo-bsc_nat/bsc_nat.c
index daa066d..401288d 100644
--- a/src/osmo-bsc_nat/bsc_nat.c
+++ b/src/osmo-bsc_nat/bsc_nat.c
@@ -1628,6 +1628,9 @@
 	rate_ctr_init(tall_bsc_ctx);
 	osmo_stats_init(tall_bsc_ctx);
 
+	/* Ensure that forced enpoint allocation is turned on by default */
+	nat->mgcp_cfg->trunk.force_realloc = 1;
+
 	/* init vty and parse */
 	if (mgcp_parse_config(config_file, nat->mgcp_cfg, MGCP_BSC_NAT) < 0) {
 		fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file);