Git commits in Moodle 3.1.5 by Petr Skoda

commit 650197e4dca12276948ec9d1fb1223996bf62e32
Author: Petr Skoda <petr.skoda@totaralms.com>
Date:   Wed, 07 Dec 2016 10:45:10 +0800
Tag:    v3.1.5

MDL-57027 fix get_users_by_capability()