Author: raortegar
MDL-84009 tool_mfa: Additional factor instances support
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ef1b8d05f6ed849a3c8cbbab86e06fe476aa10d6
http://github.com/moodle/moodle/commit/ef1b8d05f6ed849a3c8cbbab86e06fe476aa10d6
+ 4.5 en [setupfactorbuttonadditional,tool_mfa]