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/libbsc/Makefile.am b/openbsc/src/libbsc/Makefile.am
index 42fabab..5330091 100644
--- a/openbsc/src/libbsc/Makefile.am
+++ b/openbsc/src/libbsc/Makefile.am
@@ -22,5 +22,5 @@
 			bsc_api.c bsc_msc.c bsc_vty.c \
 			gsm_04_08_utils.c \
 			bsc_init.c bts_init.c bsc_rf_ctrl.c \
-			arfcn_range_encode.c
+			arfcn_range_encode.c bsc_ctrl_commands.c