[GPRS] BSSGP: Add VTY for configuration and inpection

This also includes log filtering based on NSEI/BVCI tuple
diff --git a/openbsc/src/gprs/Makefile.am b/openbsc/src/gprs/Makefile.am
index 31d3a10..098961b 100644
--- a/openbsc/src/gprs/Makefile.am
+++ b/openbsc/src/gprs/Makefile.am
@@ -6,7 +6,7 @@
 noinst_LIBRARIES = libsgsn.a
 
 libsgsn_a_SOURCES = gprs_ns.c gprs_bssgp.c gprs_llc.c gprs_gmm.c \
-		crc24.c gprs_sgsn.c gprs_bssgp_util.c
+		crc24.c gprs_sgsn.c gprs_bssgp_util.c gprs_bssgp_vty.c
 
 osmo_gbproxy_SOURCES = gb_proxy.c gb_proxy_main.c gb_proxy_vty.c \
 			gprs_ns.c gprs_ns_vty.c gprs_bssgp_util.c \