Import PHP 5.6.1 Zend Tests

Summary: Re-import our Zend tests. Use PHP 5.6.1 as the baseline. This is also after we
updated the import script too. https://github.com/facebook/hhvm/commit/b60c133884f4af5b0073909ffb157c8a134ca878

Reviewed By: @paulbiss

Differential Revision: D1604585