Author: Martin Mastny
MDL-61716 auth_oauth2: field names in mappings allow all characters
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8b58e0535c44b3e1979730e609a4c59e5cef6fb8
http://github.com/moodle/moodle/commit/8b58e0535c44b3e1979730e609a4c59e5cef6fb8
+ 3.3 en [userfieldexternalfield_error,tool_oauth2]