Author: Ankit Agarwal
MDL-56409 messages: Save one db query per page load
http://git.moodle.org/gw?p=moodle.git;a=commit;h=20ab51fdbc8e4a4a37439dda1c8b1b010a8801ed
http://github.com/moodle/moodle/commit/20ab51fdbc8e4a4a37439dda1c8b1b010a8801ed
+ 3.2 en [cachedef_message_processors_enabled,core_cache]