stats: Add vty_out_stat_item_group

This functions dumps a whole stat item group to the VTY.

Sponsored-by: On-Waves ehf
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 223535f..6065c0d 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -67,19 +67,19 @@
 ussd_ussd_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gsm/libosmogsm.la
 
 gb_bssgp_fc_test_SOURCES = gb/bssgp_fc_test.c
-gb_bssgp_fc_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gb/libosmogb.la
+gb_bssgp_fc_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gb/libosmogb.la $(top_builddir)/src/vty/libosmovty.la
 
 gb_gprs_bssgp_test_SOURCES = gb/gprs_bssgp_test.c
-gb_gprs_bssgp_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gb/libosmogb.la $(LIBRARY_DL)
+gb_gprs_bssgp_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gb/libosmogb.la $(top_builddir)/src/vty/libosmovty.la $(LIBRARY_DL)
 
 gb_gprs_ns_test_SOURCES = gb/gprs_ns_test.c
-gb_gprs_ns_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gb/libosmogb.la $(LIBRARY_DL)
+gb_gprs_ns_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gb/libosmogb.la $(top_builddir)/src/vty/libosmovty.la $(LIBRARY_DL)
 
 logging_logging_test_SOURCES = logging/logging_test.c
 logging_logging_test_LDADD = $(top_builddir)/src/libosmocore.la
 
 fr_fr_test_SOURCES = fr/fr_test.c
-fr_fr_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gb/libosmogb.la $(LIBRARY_DL)
+fr_fr_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gb/libosmogb.la $(top_builddir)/src/vty/libosmovty.la $(LIBRARY_DL)
 
 loggingrb_loggingrb_test_SOURCES = loggingrb/loggingrb_test.c
 loggingrb_loggingrb_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/vty/libosmovty.la