Notification of string changes

Author: Andrew Nicols
MDL-62047 core_userkey: Add privacy implementation


http://git.moodle.org/gw?p=moodle.git;a=commit;h=6480c4091e355e9c55132d46e2d20c060d083e3c
http://github.com/moodle/moodle/commit/6480c4091e355e9c55132d46e2d20c060d083e3c

+ 3.3 en [privacy:metadata:user_private_key:script,core_userkey]
+ 3.3 en [privacy:metadata:user_private_key:value,core_userkey]
+ 3.3 en [privacy:metadata:user_private_key:userid,core_userkey]
+ 3.3 en [privacy:metadata:user_private_key:instance,core_userkey]
+ 3.3 en [privacy:metadata:user_private_key:iprestriction,core_userkey]
+ 3.3 en [privacy:metadata:user_private_key:validuntil,core_userkey]
+ 3.3 en [privacy:metadata:user_private_key:timecreated,core_userkey]
+ 3.3 en [privacy:metadata:user_private_key,core_userkey]