Author: Shamim Rezaie
MDL-62005 block_comments: Add implementation of Privacy API
http://git.moodle.org/gw?p=moodle.git;a=commit;h=baffbd6d6f947065dc95aa43f535cc6bc56f3f32
http://github.com/moodle/moodle/commit/baffbd6d6f947065dc95aa43f535cc6bc56f3f32
+ 3.3 en [privacy:metadata:core_comment,block_comments]