Git commits in Moodle 3.3.5 by Ryan Wyllie

commit 83b01d7505b6e90201c8b010384eb96423b451bf
Author: Ryan Wyllie <ryan@moodle.com>
Date:   Tue, 16 Jan 2018 11:49:55 +0800
Tag:    v3.3.5

MDL-60918 message: use current user in message preference update