Author: Andrew Nicols
MDL-81031 admin: Add swagger UI
http://git.moodle.org/gw?p=moodle.git;a=commit;h=091ae55c20a9a7746628655c345a4b535b00ca71
http://github.com/moodle/moodle/commit/091ae55c20a9a7746628655c345a4b535b00ca71
+ 4.5 en [swaggerui,core_admin]