Author: Huong Nguyen
MDL-69615 core_backup: Send backup report email once the tasks are done
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0ba6c2d20c150014873673400e8387241ba45e9a
http://github.com/moodle/moodle/commit/0ba6c2d20c150014873673400e8387241ba45e9a
+ 4.2 en [taskautomatedbackup_report,core_admin]