Change volume driver and options JSON tags

In upcoming commits, we're going to turn on the backends for
these fields. Volumes with these set will act fundamentally
differently from other volumes. There will probably be validation
required for each field.

Until now, though, we've freely allowed creation of volumes with
these set - they just did nothing. So we have no idea what could
be in the DB with old volumes.

Change the struct tags so we don't have to worry about old,
unvalidated data. We'll start fresh with new volumes.

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

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