Git commits in Moodle 3.9.0 by Ankit Agarwal

commit 3bdb8f458436b817ac69d5f033707d926898af9e
Author: Ankit Agarwal <ankit@moodle.com>
Date:   Wed, 15 Nov 2017 16:59:17 +0800
Tag:    v3.9.0-beta

MDL-52846 tasks: Display developer notice for legacy cron