Author: Petr Škoda
MDL-44432 use new task scheduler in new logging plugins
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a9336f676c5911fd63ed17ea1a0fc56ed1413fe3
http://github.com/moodle/moodle/commit/a9336f676c5911fd63ed17ea1a0fc56ed1413fe3
+ 2.7 en [taskcleanup,logstore_legacy]
+ 2.7 en [taskcleanup,logstore_standard]