sgsn: Skeleton of a SGSN test fremwork

Based on the exsting NS/BSSGP emulation as well as the VTY, GSUP and
CTRL implementations, we are now building a test framework skeleton
for osmo-sgsn.

Change-Id: Icce90f9d8a680c7a523163e2c0bc03d12ff857e2
diff --git a/sgsn/regen_makefile.sh b/sgsn/regen_makefile.sh
new file mode 100755
index 0000000..6824d94
--- /dev/null
+++ b/sgsn/regen_makefile.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+FILES="*.ttcn BSSGP_EncDec.cc IPL4asp_PT.cc IPL4asp_discovery.cc TCCConversion.cc TCCInterface.cc NS_CodecPort_CtrlFunctDef.cc RLCMAC_EncDec.cc Native_FunctionDefs.cc SDP_EncDec.cc SDP_parse_.tab.c lex.SDP_parse_.c TELNETasp_PT.cc IPA_CodecPort_CtrlFunctDef.cc"
+
+../regen-makefile.sh SGSN_Tests.ttcn $FILES