src: Reorganizing source code in preparation to merge NRD code

Note that as of this commit, there are several changes in location of
compiled binaries in `build/` folder:

* `nfd` has been moved to `build/bin/nfd`
* `unit-tests` has been split into `unit-tests-core` and `unit-tests-daemon`

Change-Id: I2c830c117879edbaa5457d6423c13f0273285919
Refs: #1486
diff --git a/tests/core/face-uri.cpp b/tests/core/face-uri.cpp
index 5d31f66..0e54f04 100644
--- a/tests/core/face-uri.cpp
+++ b/tests/core/face-uri.cpp
@@ -24,7 +24,7 @@
 
 #include "core/face-uri.hpp"
 #ifdef HAVE_LIBPCAP
-#include "face/ethernet.hpp"
+#include "core/ethernet.hpp"
 #endif // HAVE_LIBPCAP
 
 #include "tests/test-common.hpp"