Author: Farhan Karmali
MDL-61960 blocks: Standard block plugins use legacy cron
http://git.moodle.org/gw?p=moodle.git;a=commit;h=fad9dc92902e7c1fd6d5b20d4efb78cacf51aaac
http://github.com/moodle/moodle/commit/fad9dc92902e7c1fd6d5b20d4efb78cacf51aaac
+ 3.6 en [cleanuptask,block_recent_activity]
+ 3.6 en [refreshfeedstask,block_rss_client]