Author: Andrew Nicols
MDL-63401 tool_dataprivacy: Allow expiriration of users without end date
http://git.moodle.org/gw?p=moodle.git;a=commit;h=65f77d319e7e77785cb91510c535ec4bc9b4f767
http://github.com/moodle/moodle/commit/65f77d319e7e77785cb91510c535ec4bc9b4f767
+ 3.6 en [requireallenddatesforuserdeletion,tool_dataprivacy]
+ 3.6 en [requireallenddatesforuserdeletion_desc,tool_dataprivacy]