RFC1144: integration and unit-test

The previously pushed slhc implementation has been modified to compile
and function outside of the kernel. Also debug log messages were added
and datatypes ware matched. The implementation is now ready to be used

Change-Id: I7a638e88a43b3eb9d006751a03ef2570e36613f0
diff --git a/openbsc/configure.ac b/openbsc/configure.ac
index 9dc2f8d..cebabdc 100644
--- a/openbsc/configure.ac
+++ b/openbsc/configure.ac
@@ -232,6 +232,7 @@
     tests/mm_auth/Makefile
     tests/xid/Makefile
     tests/sndcp_xid/Makefile
+    tests/slhc/Makefile
     doc/Makefile
     doc/examples/Makefile
     Makefile)