Author: Juan Leyva
MDL-56751 admin: New setting to set user created tokens duration
We were using a hardcoded value for 12 months.
With this change, administrators can change the duration time via a
security setting.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=993e81757693f0d6f076461dd631307d5922f55b
http://github.com/moodle/moodle/commit/993e81757693f0d6f076461dd631307d5922f55b
+ 3.4 en [tokenduration,core_admin]
+ 3.4 en [tokenduration_desc,core_admin]