Add sqlite-based ca storage and change the defualt ca storage type

Change-Id: I3572033801bebd78ec16bafa8aabf899e4cb3934
Refs:#4044
diff --git a/src/ca-module.hpp b/src/ca-module.hpp
index 240a011..39597e9 100644
--- a/src/ca-module.hpp
+++ b/src/ca-module.hpp
@@ -49,7 +49,7 @@
 
 public:
   CaModule(Face& face, security::v2::KeyChain& keyChain, const std::string& configPath,
-           const std::string& storageType = "ca-storage-memory");
+           const std::string& storageType = "ca-storage-sqlite3");
 
   ~CaModule();