Author: Mark Nelson
MDL-60814 auth_ldap: prevent setting names breaking site upgrades
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c8d028d3f1816f82a61e5c9cc48378a852c02928
http://github.com/moodle/moodle/commit/c8d028d3f1816f82a61e5c9cc48378a852c02928
+ 3.4 en [cannotmaprole,auth_ldap]