Author: Sara Arjona
MDL-61958 core_rss: Implement privacy API
http://git.moodle.org/gw?p=moodle.git;a=commit;h=775a804c687813828de738684e831d9b51bb9ca2
http://github.com/moodle/moodle/commit/775a804c687813828de738684e831d9b51bb9ca2
+ 3.4 en [privacy:metadata:user_private_key,core_rss]
+ 3.4 en [privacy:metadata:user_private_key:timecreated,core_rss]
+ 3.4 en [privacy:metadata:user_private_key:userid,core_rss]
+ 3.4 en [privacy:metadata:user_private_key:validuntil,core_rss]
+ 3.4 en [privacy:metadata:user_private_key:value,core_rss]