Author: David Mudrak
MDL-29977 MNet does not allow to start a remote session when masquerading as another user
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e74ffa9215507c2d02806b6e057a947611ec3eae
http://github.com/moodle/moodle/commit/e74ffa9215507c2d02806b6e057a947611ec3eae
+ 2.1 en [notpermittedtojumpas,core_mnet]