rename libcommon to libgsupclient

All that is left in libcommon now are the GSUP and OAP client implementations.
These are duplicated in osmo-sgsn.git and make sense to remain somewhat
separate from libmsc. So now they get their own little lib.

Change-Id: Ic71aa119c233b6a0ae169a5b2a53819903d2be82
diff --git a/tests/sms_queue/Makefile.am b/tests/sms_queue/Makefile.am
index 8c538b0..02bc3f2 100644
--- a/tests/sms_queue/Makefile.am
+++ b/tests/sms_queue/Makefile.am
@@ -32,7 +32,7 @@
 sms_queue_test_LDADD = \
 	$(top_builddir)/src/libmsc/libmsc.a \
 	$(top_builddir)/src/libvlr/libvlr.a \
-	$(top_builddir)/src/libcommon/libcommon.a \
+	$(top_builddir)/src/libgsupclient/libgsupclient.a \
 	$(top_builddir)/src/libcommon-cs/libcommon-cs.a \
 	$(LIBSMPP34_LIBS) \
 	$(LIBOSMOCORE_LIBS) \