Git commits in Moodle 3.1.7 by Simey Lameze

commit bd83aa0cd6c85f00d0215d67e868994f241e21ee
Author: Simey Lameze <simey@moodle.com>
Date:   Thu, 06 Jul 2017 10:37:59 +0800
Tag:    v3.1.7

MDL-59456 auth_cas: patch phpCAS auth bypass vulnerability