util: Change "common.hpp" to "../common.hpp"

refs: #2068

Change-Id: I05503c44615a09a1afeb1648b4e0d50882df651a
diff --git a/src/util/ethernet.hpp b/src/util/ethernet.hpp
index 2adb085..11788f0 100644
--- a/src/util/ethernet.hpp
+++ b/src/util/ethernet.hpp
@@ -28,7 +28,7 @@
 #ifndef NDN_UTIL_ETHERNET_HPP
 #define NDN_UTIL_ETHERNET_HPP
 
-#include "common.hpp"
+#include "../common.hpp"
 
 #include <boost/array.hpp>
 
diff --git a/src/util/face-uri.hpp b/src/util/face-uri.hpp
index 95d2c87..0e51012 100644
--- a/src/util/face-uri.hpp
+++ b/src/util/face-uri.hpp
@@ -28,7 +28,7 @@
 #ifndef NDN_UTIL_FACE_URI_HPP
 #define NDN_UTIL_FACE_URI_HPP
 
-#include "common.hpp"
+#include "../common.hpp"
 #include <boost/asio/ip/udp.hpp>
 #include <boost/asio/ip/tcp.hpp>
 #include <boost/asio/local/stream_protocol.hpp>