core: move event-emitter to core

Change-Id: I76f6fc7d8c4731bbbb95ea257e339e15b96dbea1
diff --git a/daemon/util/event-emitter.hpp b/daemon/core/event-emitter.hpp
similarity index 97%
rename from daemon/util/event-emitter.hpp
rename to daemon/core/event-emitter.hpp
index 0e30970..b735c20 100644
--- a/daemon/util/event-emitter.hpp
+++ b/daemon/core/event-emitter.hpp
@@ -4,8 +4,8 @@
  * See COPYING for copyright and distribution information.
  */
 
-#ifndef NFD_UTIL_EVENT_EMITTER_HPP
-#define NFD_UTIL_EVENT_EMITTER_HPP
+#ifndef NFD_CORE_EVENT_EMITTER_HPP
+#define NFD_CORE_EVENT_EMITTER_HPP
 
 #include "common.hpp"
 
@@ -322,4 +322,4 @@
 
 } // namespace nfd
 
-#endif // NFD_UTIL_EVENT_EMITTER_HPP
+#endif // NFD_CORE_EVENT_EMITTER_HPP
diff --git a/daemon/face/face.hpp b/daemon/face/face.hpp
index d6da710..9ff2d20 100644
--- a/daemon/face/face.hpp
+++ b/daemon/face/face.hpp
@@ -8,7 +8,7 @@
 #define NFD_FACE_FACE_H
 
 #include "common.hpp"
-#include "util/event-emitter.hpp"
+#include "core/event-emitter.hpp"
 
 namespace nfd {