Description:
------------
When I perform a HTTP timeout using "stream_context_create", "stream_set_timeout" or "default_socket_timeout", timeout is doubled.

I did it on : 
- Windows XP SP2 + PHP-Cli 5.1.6
- Windows XP SP2 + PHP-Cli 5.2.9-2
- Debian 5 + PHP 5.2.0-8+etch13 (cli)

Reproduce code:
---------------
<?php
$time = time();

// sleep-flush.php flush a text before sleeping 20 seconds
$f = @fopen('http://localhost/sleep-flush.php', 'r');
if( $f !== false ) {
	stream_set_timeout($f, 2);
	$content = stream_get_contents( $f );
	fclose($f);
}
echo 'Code #1: Duration = ', (time() - $time), "\n";

$context = stream_context_create(array('http' => array('timeout' => 3)));

$time = time();
// sleep do not flush text before sleeping 20 seconds
$f = @fopen('http://localhost/sleep.php', 'r', false, $context);
if( $f !== false ) {
	$content = stream_get_contents( $f );
	fclose($f);
}
echo 'Code #2: Duration = ', (time() - $time), "\n";

ini_set('default_socket_timeout', '4');

$time = time();
// sleep do not flush text before sleeping 20 seconds
$f = @fopen('http://localhost/sleep.php', 'r');
if( $f !== false ) {
	$content = stream_get_contents( $f );
	fclose($f);
}
echo 'Code #3: Duration = ', (time() - $time), "\n";

?>

Expected result:
----------------
Code #1: Duration = 2
Code #2: Duration = 3
Code #3: Duration = 4


Actual result:
--------------
Code #1: Duration = 4
Code #2: Duration = 6
Code #3: Duration = 8