3 - The KeystoneFernetKeys parameter was introduced, which is able to take any
4 amount of keys as long as it's in the right format. It's generated by the
5 same mechanism as the rest of the passwords; so it's value is also
6 available via mistral's "password" environment variable. This will also
7 allow for rotations to be made via mistral and via stack updates.
9 - The individual keystone fernet key parameters (KeystoneFernetKey0 and
10 KeystoneFernetKey1) were deprecated in favor of KeystoneFernetKeys.