Author: Peter Dias
MDL-65637 core_oauth2: Introduce a new custom linkedin oauth2 client
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a593731e7c2576005b0de95bf715d9f036feaedf
http://github.com/moodle/moodle/commit/a593731e7c2576005b0de95bf715d9f036feaedf
+ 3.11 en [linkedin_service,tool_oauth2]