core: move nfd-specific files to daemon/

Refs: #4922
Change-Id: I2243dbb87c63f9cbaf7d7051d7a0d4bca2f9fdb5
diff --git a/daemon/main.cpp b/daemon/main.cpp
index 0675620..8a236ab 100644
--- a/daemon/main.cpp
+++ b/daemon/main.cpp
@@ -26,10 +26,10 @@
 #include "nfd.hpp"
 #include "rib/service.hpp"
 
-#include "core/logger.hpp"
-#include "core/privilege-helper.hpp"
+#include "common/global.hpp"
+#include "common/logger.hpp"
+#include "common/privilege-helper.hpp"
 #include "core/version.hpp"
-#include "daemon/global.hpp"
 
 #include <string.h> // for strsignal()