security+node: Fixing includes and removing deprecated files

Change-Id: If1565b8ae9c1c1dd78a0bc0490c76a836c1ceacf
diff --git a/src/security/certificate/public-key.cpp b/src/security/certificate/public-key.cpp
index 131e3c1..205dcd2 100644
--- a/src/security/certificate/public-key.cpp
+++ b/src/security/certificate/public-key.cpp
@@ -7,8 +7,7 @@
  */
 
 #include <ndn-cpp/common.hpp>
-
-#include "public-key.hpp"
+#include <ndn-cpp/security/certificate/public-key.hpp>
 
 #if NDN_CPP_USE_SYSTEM_BOOST
 #include <boost/iostreams/stream.hpp>