Author: Juan Leyva
MDL-55923 webservice: Add global setting for forcing token deletion
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6a0929585764eb1f5ec3004fa16d57abbffece25
http://github.com/moodle/moodle/commit/6a0929585764eb1f5ec3004fa16d57abbffece25
+ 3.2 en [passwordchangetokendeletion,core_admin]
+ 3.2 en [passwordchangetokendeletion_desc,core_admin]