Author: Ilya Tregubov
MDL-73981 tool_uploadcourse: Validate enrolment role from csv.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a174a570a62694ec1bed960a446ba82ca62b8fb8
http://github.com/moodle/moodle/commit/a174a570a62694ec1bed960a446ba82ca62b8fb8
+ 3.11 en [contextrolenotallowed,core_role]