Author: David Monllao
MDL-59630 analytics: New clean up task
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f9222c4953d352dc9a58522d9f91ac59d77db7e7
http://github.com/moodle/moodle/commit/f9222c4953d352dc9a58522d9f91ac59d77db7e7
+ 3.4 en [taskanalyticscleanup,core_admin]