Git commits in Moodle 2.7.17 by Juan Leyva

commit e552a8c7a2bda57822bf42aa1bdc8913fedc0801
Author: Juan Leyva <juanleyvadelgado@gmail.com>
Date:   Thu, 22 Sep 2016 17:52:11 +0800
Tag:    v2.7.17

MDL-56065 user: Fix update_users Web Service