Author: Petr Skoda
MDL-47800 auth: Add option to logout on pw change
http://git.moodle.org/gw?p=moodle.git;a=commit;h=866f03de46617ee155d346a0d379761157dde7b4
http://github.com/moodle/moodle/commit/866f03de46617ee155d346a0d379761157dde7b4
+ 2.9 en [passwordchangelogout,core_admin]
+ 2.9 en [passwordchangelogout_desc,core_admin]