Author: Andrew Nicols
MDL-77186 core: Add a new keepalive setting to cron
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1b59967d716e1e089b2da75a410de1fd84a8bc5a
http://github.com/moodle/moodle/commit/1b59967d716e1e089b2da75a410de1fd84a8bc5a
+ 4.2 en [cron_keepalive,core_admin]
+ 4.2 en [cron_keepalive_desc,core_admin]