Allow initial opt-out from remote sync peer

[aeplay]

[tobiaslins]

Thoughts on this: I think there should be a way to define on a covalue level if it should be synced or not.

I'd like to

• sync "organizations" and "billing objects" always
• allow to disable syncing of a key of an organization

[aeplay]

Implemented as part of the auth update in Jazz 0.10