tests: Introduce running tests with GNU autotest in OpenBSC

The quality of the tests is of different value but it is good to
get started and improve from here.
diff --git a/openbsc/tests/gsm0408/Makefile.am b/openbsc/tests/gsm0408/Makefile.am
index 90ca05b..6ecdc07 100644
--- a/openbsc/tests/gsm0408/Makefile.am
+++ b/openbsc/tests/gsm0408/Makefile.am
@@ -2,6 +2,8 @@
 AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS)
 noinst_PROGRAMS = gsm0408_test
 
+EXTRA_DIST = gsm0408_test.ok
+
 gsm0408_test_SOURCES = gsm0408_test.c
 gsm0408_test_LDADD =	$(top_builddir)/src/libbsc/libbsc.a \
 			$(top_builddir)/src/libmsc/libmsc.a \
diff --git a/openbsc/tests/gsm0408/gsm0408_test.ok b/openbsc/tests/gsm0408/gsm0408_test.ok
new file mode 100644
index 0000000..52c601e
--- /dev/null
+++ b/openbsc/tests/gsm0408/gsm0408_test.ok
@@ -0,0 +1,5 @@
+Testing test location area identifier
+Testing parsing and generating TMSI/IMSI
+hex: 17 08 99 78 56 34 12 90 78 36 
+hex: 17 09 91 78 56 34 12 90 78 56 f4 
+Done.