src: Another round of source updates: moving all headers close to implementation files

Change-Id: I3d47076504950e67746174623c75383948e9d93d
diff --git a/src/security/certificate.cpp b/src/security/certificate.cpp
index add546c..e94f962 100644
--- a/src/security/certificate.cpp
+++ b/src/security/certificate.cpp
@@ -18,9 +18,9 @@
 #pragma GCC diagnostic ignored "-Wunused-function"
 #endif
 
-#include <ndn-cpp-dev/common.hpp>
+#include "common.hpp"
 
-#include <ndn-cpp-dev/security/certificate.hpp>
+#include "security/certificate.hpp"
 
 #include "../util/logging.hpp"
 #include "../util/time.hpp"