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-scheduler.cpp b/tests/util/test-scheduler.cpp
index 66417da..01fb18c 100644
--- a/tests/util/test-scheduler.cpp
+++ b/tests/util/test-scheduler.cpp
@@ -6,7 +6,7 @@
 
 #include "util/scheduler.hpp"
 
-#include <boost/test/unit_test.hpp>
+#include "boost-test.hpp"
 
 namespace ndn {