merge detail folders

Change-Id: Id8f126bb4f4dd621f224d3d705b22f85e00babad
diff --git a/tests/unit-tests/configuration.t.cpp b/tests/unit-tests/configuration.t.cpp
index eb9619b..7d5c901 100644
--- a/tests/unit-tests/configuration.t.cpp
+++ b/tests/unit-tests/configuration.t.cpp
@@ -19,7 +19,7 @@
  */
 
 #include "configuration.hpp"
-#include "protocol-detail/info-encoder.hpp"
+#include "detail/info-encoder.hpp"
 #include "test-common.hpp"
 
 namespace ndn {