NAT: vty command to display number of BSCs

Add command 'show nat num-bscs-configured' to display number of configured BSCs.

Sponsored-by: On-Waves ehf
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c b/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c
index cd8293c..5af6d97 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c
@@ -204,6 +204,14 @@
 	return CMD_SUCCESS;
 }
 
+DEFUN(show_nat_bsc, show_nat_bsc_cmd, "show nat num-bscs-configured",
+      SHOW_STR "Display NAT configuration details\n"
+      "BSCs-related\n")
+{
+	vty_out(vty, "%d BSCs configured%s", _nat->num_bsc, VTY_NEWLINE);
+	return CMD_SUCCESS;
+}
+
 DEFUN(show_bsc, show_bsc_cmd, "show bsc connections",
       SHOW_STR BSC_STR
       "All active connections\n")
@@ -1169,6 +1177,7 @@
 	/* show commands */
 	install_element_ve(&show_sccp_cmd);
 	install_element_ve(&show_bsc_cmd);
+	install_element_ve(&show_nat_bsc_cmd);
 	install_element_ve(&show_bsc_cfg_cmd);
 	install_element_ve(&show_stats_cmd);
 	install_element_ve(&show_stats_lac_cmd);