Bug 1094007 - PHP cart: update pear.php.net channel when install

This patch fixes the warning in PHP cart when installing dependencies: _channel "pear.php.net" has updated its protocols, use "pear channel-update pear.php.net" to update._

See [Bug 1094007](https://bugzilla.redhat.com/show_bug.cgi?id=1094007)
[Trello card](https://trello.com/c/RsENlXNV/257-5-fix-5-existing-bugs)