security: Move security-related files from ~/.ndnx to ~/.ndn

refs: #1363

Change-Id: Ie9f2fdd794dcdbf9cb95083efd79e468fea52e30
diff --git a/src/security/sec-public-info-sqlite3.cpp b/src/security/sec-public-info-sqlite3.cpp
index 393355f..712bf7d 100644
--- a/src/security/sec-public-info-sqlite3.cpp
+++ b/src/security/sec-public-info-sqlite3.cpp
@@ -90,7 +90,7 @@
 
 SecPublicInfoSqlite3::SecPublicInfoSqlite3()
 {
-  boost::filesystem::path identityDir = boost::filesystem::path(getenv("HOME")) / ".ndnx";
+  boost::filesystem::path identityDir = boost::filesystem::path(getenv("HOME")) / ".ndn";
   boost::filesystem::create_directories (identityDir);
 
   /// @todo Add define for windows/unix in wscript. The following may completely fail on windows