Return an sqlite connection

def _conn(queue):
    '''
    Return an sqlite connection
    '''
    queue_dir = __opts__['sqlite_queue_dir']
    db = os.path.join(queue_dir, '{0}.db'.format(queue))
    log.debug('Connecting to: %s', db)

    con = sqlite3.connect(db)
    tables = _list_tables(con)
    if queue not in tables:
        _create_table(con, queue)
    return con