Author: Frederic Massart
MDL-36426 repository: Prevent login_as() users to access
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ded4050f1bb050770df3bc8e78dcfadf815011ea
http://github.com/moodle/moodle/commit/ded4050f1bb050770df3bc8e78dcfadf815011ea
+ 2.3 en [nopermissiontoaccess,core_repository]