build: Warnings correction for gcc 4.2

Also in this commit some code style corrections.

Change-Id: Idf2b5b96b328fb3dbea7440362c84d7759a10ec5
Refs: #1429
diff --git a/tests/util/test-io.cpp b/tests/util/test-io.cpp
index 1e8b0bd..c3c247b 100644
--- a/tests/util/test-io.cpp
+++ b/tests/util/test-io.cpp
@@ -3,11 +3,11 @@
  * See COPYING for copyright and distribution information.
  */
 
-#include <boost/test/unit_test.hpp>
-
 #include "util/io.hpp"
 #include "security/key-chain.hpp"
 
+#include "boost-test.hpp"
+
 namespace ndn {
 
 BOOST_AUTO_TEST_SUITE(TestIO)