Add php native authorization headers

[dzubchik]

Hi! We faced with missing php headers during basic authentication, so Symfony BasicAuthenticationListener could not work correctly. In this PR i propose to add appropriate headers.

[marcj]

Isn't PHP_AUTH_USER etc in the _SERVER bag instead of header?

[marcj]

Just checked: \Symfony\Component\HttpFoundation\ServerBag::initialize which is used in the constructor uses the information in _SERVER/$server (where PHP_AUTH_USER belongs to) to populate its $headers ($this->headers = new HeaderBag($this->server->getHeaders());).

So if you could place it in $_SERVER['PHP_AUTH_USER'] = ... (and clear those keys on every request first) anything else is done automatically. We need for this also to replace $syRequest->headers->replace($headers); with $syRequest->headers->add($headers);.

[dzubchik]

@marcj , yes, you are right - php-doc. I will update PR according to this.

[marcj]

Thanks!