Guarantee that all db related files are deleted together.

When deleting a db file, all db related files has to be deleted together
like journal, wal, shm etc.

Change-Id: I49d4581673d03fe669e9e0eaa2b50f7b9d3c34a4
Signed-off-by: jangwon.lee <jangwon.lee@lge.com>