security+node: Fixing includes and removing deprecated files

Change-Id: If1565b8ae9c1c1dd78a0bc0490c76a836c1ceacf
diff --git a/src/security/identity/identity-manager.cpp b/src/security/identity/identity-manager.cpp
index 0c57212..44f0d0b 100644
--- a/src/security/identity/identity-manager.cpp
+++ b/src/security/identity/identity-manager.cpp
@@ -21,8 +21,8 @@
 #include "../../util/logging.hpp"
 #include "../../c/util/time.h"
 #include <ndn-cpp/security/identity/identity-manager.hpp>
-#include "../certificate/identity-certificate.hpp"
-#include "../signature/signature-sha256-with-rsa.hpp"
+#include <ndn-cpp/security/certificate/identity-certificate.hpp>
+#include <ndn-cpp/security/signature/signature-sha256-with-rsa.hpp>
 
 INIT_LOGGER("ndn.security.IdentityManager")