libbsc: Add ctrl command for MNC, MCC, short-name and long-name

Add the framework for adding more setting commands.
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c b/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c
index 1d0e2aa..1442cbc 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_ctrl.c
@@ -605,6 +605,9 @@
 {
 	int rc;
 
+	rc = bsc_base_ctrl_cmds_install();
+	if (rc)
+		goto end;
 	rc = ctrl_cmd_install(CTRL_NODE_BTS, &cmd_bts_rf_state);
 	if (rc)
 		goto end;