tools: add dhtnet-certmgr

Certificate manager: generate and load certificate/identity

Change-Id: I920834133b5f78985833ee4043b5aa4562211197
diff --git a/tools/dnc/main.cpp b/tools/dnc/main.cpp
index 363e05e..02debd5 100644
--- a/tools/dnc/main.cpp
+++ b/tools/dnc/main.cpp
@@ -16,6 +16,7 @@
  */
 #include "dnc.h"
 #include "common.h"
+#include "dhtnet_crtmgr/dhtnet_crtmgr.h"
 
 #include <string>
 #include <vector>