utils: move small utilities from tests/ dir to utils/

We want to start building up tests under tests, and the current contents
are more utilities.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
diff --git a/Makefile b/Makefile
index ee1eee8..86b6c2f 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@
 libmctp.a:
 	$(AR) rcsTPD $@ $^
 
-tests/%: tests/%.o libmctp.a
+utils/%: utils/%.o libmctp.a
 	$(LINK.o) -o $@ $^
 
 clean: