build: Warnings correction for gcc 4.2

Also in this commit some code style corrections.

Change-Id: Idf2b5b96b328fb3dbea7440362c84d7759a10ec5
Refs: #1429
diff --git a/tests/security/test-signed-interest.cpp b/tests/security/test-signed-interest.cpp
index db051c3..b870fb1 100644
--- a/tests/security/test-signed-interest.cpp
+++ b/tests/security/test-signed-interest.cpp
@@ -4,14 +4,14 @@
  * See COPYING for copyright and distribution information.
  */
 
-#include <boost/test/unit_test.hpp>
-
 #include "security/key-chain.hpp"
 #include "security/validator.hpp"
 
 #include "util/command-interest-generator.hpp"
 #include "util/command-interest-validator.hpp"
 
+#include "boost-test.hpp"
+
 using namespace std;
 namespace ndn {