Author: Paul Holden
MDL-80727 tool_task: replace hard-coded adhoc task runner strings.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6dc458a4f91958df9b37c2aae483187dca583c7a
http://github.com/moodle/moodle/commit/6dc458a4f91958df9b37c2aae483187dca583c7a
+ 4.2 en [runadhoctask,tool_task]
+ 4.2 en [runadhoctasks,tool_task]
+ 4.2 en [runadhoctasksfailed,tool_task]