hsl: BTS support

This patch adds the BTS support for the hsl driver.

It includes two examples under the tests/ directory.
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 5cb6447..26500a1 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -4,6 +4,8 @@
 
 noinst_PROGRAMS = e1inp_ipa_bsc_test	\
 		  e1inp_ipa_bts_test	\
+		  e1inp_hsl_bsc_test	\
+		  e1inp_hsl_bts_test	\
 		  ipa_proxy_test
 
 e1inp_ipa_bsc_test_SOURCES = e1inp_ipa_bsc_test.c
@@ -14,6 +16,14 @@
 e1inp_ipa_bts_test_LDADD = $(top_builddir)/src/libosmoabis.la \
 			$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS)
 
+e1inp_hsl_bsc_test_SOURCES = e1inp_hsl_bsc_test.c
+e1inp_hsl_bsc_test_LDADD = $(top_builddir)/src/libosmoabis.la \
+			$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS)
+
+e1inp_hsl_bts_test_SOURCES = e1inp_hsl_bts_test.c
+e1inp_hsl_bts_test_LDADD = $(top_builddir)/src/libosmoabis.la \
+			$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS)
+
 ipa_proxy_test_SOURCES = ipa_proxy_test.c
 ipa_proxy_test_LDADD = $(top_builddir)/src/libosmoabis.la \
 			$(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS)