Author: Zig Tan
MDL-61568 repository_s3: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9556d7bb2b96f31851e3fba56ef6c35a99ec333c
http://github.com/moodle/moodle/commit/9556d7bb2b96f31851e3fba56ef6c35a99ec333c
+ 3.4 en [privacy:metadata,repository_s3]