Enable authentication to sqlite db

[dschowta]

Make the sqlite database protected from unauthorized access outside HDS. Starting point for this can be this.

[dschowta]

It would also be beneficial to add the same for registry DB (leveldb)

[farshidtz]

If you keep the encryption keys locally, it is in the end as secure as the filesystem even if you encrypt the DB. Unless if the encryption is done with user-managed keys.