security: Changing security storage location. Adding test case

1. The default location of publilc info storage of SecPublicInfoSqlite3 is changed to ~/.ndnx/ndnsec-public-info.db
2. The default location of key directory of SecTpmFile is changed to ~/.ndnx/ndnsec-tpm-file/
3. Add a test case for SecTpmFile.

Change-Id: I2e314072ff05e3b8da308b577bc85d417ff22476
diff --git a/src/security/sec-public-info-sqlite3.cpp b/src/security/sec-public-info-sqlite3.cpp
index 80f7b78..6c1ea7b 100644
--- a/src/security/sec-public-info-sqlite3.cpp
+++ b/src/security/sec-public-info-sqlite3.cpp
@@ -102,7 +102,7 @@
   // TODO: Handle non-unix file systems which don't have "mkdir -p".
   ::system(("mkdir -p " + identityDir).c_str());
   
-  int res = sqlite3_open((identityDir + '/' + "ndnsec-identity.db").c_str(), &database_);
+  int res = sqlite3_open((identityDir + '/' + "ndnsec-public-info.db").c_str(), &database_);
 
   if (res != SQLITE_OK)
     throw Error("identity DB cannot be opened/created");