Return a list of all job ids
    For master job cache this also formats the output and returns a string

def get_jids():
    '''
    Return a list of all job ids
    For master job cache this also formats the output and returns a string
    '''
    conn = _get_conn()
    cur = conn.cursor()
    sql = '''SELECT ''' \
          '''jid, tgt_type, cmd, tgt, kwargs, ret, username, arg, fun ''' \
          '''FROM jids'''
    if __opts__['keep_jobs'] != 0:
        sql = sql + " WHERE started > NOW() - INTERVAL '" \
                + six.text_type(__opts__['keep_jobs']) + "' HOUR"

    cur.execute(sql)
    ret = {}
    data = cur.fetchone()
    while data:
        data_dict = _build_dict(data)
        ret[data_dict["jid"]] = \
            _format_jid_instance(data_dict["jid"], data_dict)
        data = cur.fetchone()
    cur.close()
    conn.close()
    return ret