Git commits in Moodle 3.7.x by Michael Hughes

commit b09c036bb81d40186c592cf7892ac495489698b4
Author: Michael Hughes <michaelhughes@strath.ac.uk>
Date:   Sat, 23 Feb 2019 00:39:37 +0800
Tag:    v3.7.0-beta

MDL-60683 quiz: Replace quiz legacy cron with tasks