security: change enum to enum class in security-common.hpp

Change-Id: I5565c845cd57f3457c8120b11399a105fa83418d
Refs: #3083
diff --git a/tools/ndnsec/set-acl.hpp b/tools/ndnsec/set-acl.hpp
index fb720a3..ca639b6 100644
--- a/tools/ndnsec/set-acl.hpp
+++ b/tools/ndnsec/set-acl.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2013-2015 Regents of the University of California.
+ * Copyright (c) 2013-2016 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -80,7 +80,7 @@
     }
 
   KeyChain keyChain;
-  keyChain.addAppToAcl(keyName, KEY_CLASS_PRIVATE, appPath, ACL_TYPE_PRIVATE);
+  keyChain.addAppToAcl(keyName, KeyClass::PRIVATE, appPath, AclType::PRIVATE);
 
   return 0;
 }