Changing recovery key password process improvements

[enbrnz]

WHAT Needs to be Documented?

• appid is encryption not files_encryption in the database
• Process should also delete rows from oc_preferences table where configkey is recoveryEnabled and configvalue is 1, this ensures the users don't have to first disable recovery key before re-enabling it with the new key.
• Share keys should be removed as well. They are in the user data folders files_encryption/OC_DEFAULT_MODULE/<filename>/${recoveryKeyId}.shareKey

WHERE Does This Need To Be Documented (Link)?

https://doc.owncloud.com/server/10.9/admin_manual/configuration/files/encryption/encryption_configuration.html#changing-the-recovery-key-password

WHY Should This Change Be Made?

Makes it easier for admins to check whether the new recovery key has been applied to all users for migrating away from user-key-encryption

(Optional) What Type Of Content Change Is This?

• New Content Addition
• Old Content Deprecation
• Existing Content Simplification
• Bug Fix to Existing Content

(Optional) Which Manual Does This Relate To?

• Admin Manual
• Developer Manual
• User Manual
• Android
• iOS
• Branded Clients
• Desktop Client
• Other