Git commits in Moodle 3.5.0 by Marcus Boon

commit f8e2383bdd0239453a75c3632f8c82970b0a0163
Author: Marcus Boon <marcus@catalyst-au.net>
Date:   Thu, 13 Jul 2017 12:44:29 +0800
Tag:    v3.5.0-beta

MDL-59866 session: Add retry for redis sessions