Author: Zig Tan
MDL-61568 repository_s3: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bbaea992ab8896366f5ef19bd2365caaed7db8e2
http://github.com/moodle/moodle/commit/bbaea992ab8896366f5ef19bd2365caaed7db8e2
+ 3.3 en [privacy:metadata,repository_s3]