Provider storage

[Andrew Wilkins]

Hi all,

Storage is no longer a requirement for providers. We're now storing tools
and charms in GridFS (MongoDB), with metadata in state. Several of the
providers continue to use storage internally to record state server
instance IDs, but this is now an internal detail for those providers.
Please don't go using provider storage for anything new.

Backups are currently still using provider storage, *if* it is implemented.
If it's not implemented, you'll get an error if you try to perform a
backup. We'll need to migrate away from provider storage for backups too,
eventually, if we're to provide a consistent solution; all existing
providers continue to implement Storage internally, for the time being, so
there's no huge rush.

Cheers,
Andrew
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