Description:
------------
If mysql query is longer as request_slowlog_timeout, connection breaks.

Test script:
---------------
<?php

// request_slowlog_timeout = 10s  (at /etc/php5/fpm/php-fpm.conf)


// $mysqli =
// ...
$query = "SELECT SLEEP (15)";

$res = $mysqli->query($query);
if (!$res) {
	echo $mysqli->error; // Error Code: 2013. Lost connection to MySQL server during query
	exit;
}


Expected result:
----------------
connection must be preserved and the request should be executed