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-nitb/bsc_hack.c b/openbsc/src/osmo-nitb/bsc_hack.c
index 96ae0b8..d746bf1 100644
--- a/openbsc/src/osmo-nitb/bsc_hack.c
+++ b/openbsc/src/osmo-nitb/bsc_hack.c
@@ -290,6 +290,11 @@
 		return -1;
 	}
 
+	if (bsc_base_ctrl_cmds_install() != 0) {
+		printf("Failed to initialize the control commands. Exiting.\n");
+		return -1;
+	}
+
 	/* seed the PRNG */
 	srand(time(NULL));