Author: Simey Lameze
MDL-65050 core: rename task to question_preview_cleanup_task
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5a01c2409a5a446b2891ae9bd2b45e0d0ca76edc
http://github.com/moodle/moodle/commit/5a01c2409a5a446b2891ae9bd2b45e0d0ca76edc
+ 3.7 en [taskquestioncron,core_admin]