Description:
------------
When fopen'ing a web page, and using a proxy in the stream context, there is no way to specify proxy username and password

N.B. non-authenticating proxies work just fine.

Reproduce code:
---------------
<?php
$opts = array('http' =>
    array(
	  'proxy' => 'tcp://localhost:2001/',
	  'request_fulluri' => True,
	  'proxy_login' => 'fest1',
	  'proxy_password' => 'xxx'
    )
);
$context  = stream_context_create($opts);
$fp=fopen("http://www.lgl.lu/", "r", false, $context)
  or die("Cannot load\n");
print "fp=$fp";
while(!feof($fp)) {
  $in=fgets($fp,1024);
  print $in;
 }
?>


Expected result:
----------------
It should display the page from www.lgl.lu

Actual result:
--------------
It logs an error:
[Fri Jun 29 11:06:21 2007] [error] [client ::1] PHP Warning:  fopen(http://www.lgl.lu/) [<a href='function.fopen'>function.fopen</a>]: failed to open stream: HTTP request failed! HTTP/1.0 407 Proxy Authentication Required\r\n in /home/aknaff/public_html/php-test/download.php on line 14

and this even though login and password are correct.