Fix syntax error in DistributedLock "DELETE"

Changed the "DELETE" to "DELETE FROM" to fix this error:
  You have an error in your SQL syntax; check the manual that corresponds
  to your MariaDB server version for the right syntax to use

Issue-ID: POLICY-2203
Signed-off-by: Jim Hahn <jrh3@att.com>
Change-Id: I10a398c13dc3da547d2b3ea47564ab0d5761a2ee
1 file changed