Enhanced dbsim to store view and position in storage engine

Mimic real DBMS implementation by storing view and position
into storage engine.

dbsim/db_server_service.hpp

@@ -59,7 +59,6 @@ namespace db
         void debug_sync(const char*) override;
     private:
         db::server& server_;
-        wsrep::view logged_view_;
     };
 }