Author: raortegar
MDL-79131 core: Added failed task message notification
http://git.moodle.org/gw?p=moodle.git;a=commit;h=cc6316368e1fc48ed5d4f9d26b4cde0b531ac7bd
http://github.com/moodle/moodle/commit/cc6316368e1fc48ed5d4f9d26b4cde0b531ac7bd
+ 4.4 en [messageprovider:failedtaskmaxdelay,core]