fix unit tests for Windows

existed problems (will be solved later) :
 ZendTest\Code\Generator\FileGeneratorTest.php:314
 ZendTest\Code\Generator\FileGeneratorTest.php:360
 ZendTest\Form\View\Helper\FormDateTimeSelectTest.php:93
 ZendTest\Session\SessionArrayStorageTest.php:182
 ZendTest\Validator\HostnameTest.php:504