Git commits in Moodle 3.0.9 by Marina Glancy

commit 0833e7cfc75c88808257d33d1cd5eb3518150eb0
Author: Marina Glancy <marina@moodle.com>
Date:   Sat, 04 Mar 2017 12:22:12 +0800
Tag:    v3.0.9

MDL-58010 user: allow to update only whitelisted preferences