LP#1557621 Verify password barcode / deleted users repair

LP#1557621 Verify password barcode / deleted users repair

* Fixes bug that caused password verify calls to fail with an exception
  when tested with a barcode.

* Verify API always returns false when tested on deleted users.

To test:

1. In the staff client, navigate to Circulation -> Verify Credentials
2. Confirm username and barcode lookups return success for a non-deleted
   user using the correct password.
3. Delete a test user in the database:
   UPDATE actor.usr SET deleted = TRUE WHERE id = <id-of-test-user>;
4. Re-do step 2 confirming non-success results are returned.

Signed-off-by: Bill Erickson <berickxx@gmail.com>