[hatohol-init-user-generator] Add a tool to generate SQL statement for initial users.
[hatohol-db-initiator] Load initial users if needed.
[hatohol-db-initiator] Check the existence of SQL files.

The previous code doesn't show any message even if it's not found.
The behavior is too unfriendly for users.
[hatohol-db-initiator] Clean up.
[DBTablesUser] Remove a test flag from DBTablesConfig.

Now the initial users are registered by hatohol-db-initiator.
Merge pull request #597 from project-hatohol/initial-user

Create initial users by hatohol-db-initiator