Author: Sirisha Garapati
MDL-49827 core: Expose the noemailever config in the admin UI
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5c203e8dc3770da49b7f1ee70e856c8d4fbd02f3
http://github.com/moodle/moodle/commit/5c203e8dc3770da49b7f1ee70e856c8d4fbd02f3
+ 4.3 en [noemaileverwarning,core_admin]