Author: Juan Leyva
MDL-60572 admin: Enforce URLs in forgottenpasswordurl setting
Also display warnings for admins.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6078d420bf1749f16dac0b4a7c07d78ae62a6fd5
http://github.com/moodle/moodle/commit/6078d420bf1749f16dac0b4a7c07d78ae62a6fd5
+ 3.4 en [invalidforgottenpasswordurl,core_admin]