Author: sam marshall
MDL-39448 MUC: Memcache configurable key names
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c797c995a0cc4dbfdb482564b094395d949ed5ca
http://github.com/moodle/moodle/commit/c797c995a0cc4dbfdb482564b094395d949ed5ca
+ 2.5 en [prefix,cachestore_memcache]
+ 2.5 en [prefix_help,cachestore_memcache]