Initial SIMTRACE testsuite

This doesn't really do much yet in terms of test coverage, but it
adds all related infrastructure

Change-Id: If9fa66b6c5fbddd742ff61fa2c1345736d07accd
diff --git a/Makefile b/Makefile
index 4ceacf3..90b54b3 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-SUBDIRS=bsc bsc-nat bts ggsn_tests hlr mgw msc pcu remsim sccp selftest sgsn sip stp sysinfo
+SUBDIRS=bsc bsc-nat bts ggsn_tests hlr mgw msc pcu remsim sccp selftest sgsn \
+	simtrace sip stp sysinfo
 
 NPROC=$(shell nproc 2>/dev/null)
 ifeq ($(NPROC),)