Get a cursor and run a query. Reconnect up to `retries` times if
    needed.
    Returns: cursor, affected rows counter
    Raises: SaltCacheError, AttributeError, OperationalError

def run_query(conn, query, retries=3):
    '''
    Get a cursor and run a query. Reconnect up to `retries` times if
    needed.
    Returns: cursor, affected rows counter
    Raises: SaltCacheError, AttributeError, OperationalError
    '''
    try:
        cur = conn.cursor()
        out = cur.execute(query)
        return cur, out
    except (AttributeError, OperationalError) as e:
        if retries == 0:
            raise
        # reconnect creating new client
        sleep(_RECONNECT_INTERVAL_SEC)
        if conn is None:
            log.debug("mysql_cache: creating db connection")
        else:
            log.info("mysql_cache: recreating db connection due to: %r", e)
        global client
        client = MySQLdb.connect(**_mysql_kwargs)
        return run_query(client, query, retries - 1)
    except Exception as e:
        if len(query) > 150:
            query = query[:150] + "<...>"
        raise SaltCacheError("Error running {0}: {1}".format(query, e))