management: process Nack in nfd::Controller

refs #3264

Change-Id: Ifaa73ac04e8838a89708fc63a578941d700712c6
diff --git a/src/management/nfd-controller.hpp b/src/management/nfd-controller.hpp
index 331810f..4fbfa3e 100644
--- a/src/management/nfd-controller.hpp
+++ b/src/management/nfd-controller.hpp
@@ -84,10 +84,13 @@
 
 public:
   /** \brief error code for timeout
-   *  \note comes from http://msdn.microsoft.com/en-us/library/windows/desktop/ms740668.aspx
    */
   static const uint32_t ERROR_TIMEOUT;
 
+  /** \brief error code for network Nack
+   */
+  static const uint32_t ERROR_NACK;
+
   /** \brief error code for server error
    */
   static const uint32_t ERROR_SERVER;