The db::view code already uses proxy rather actively, so instead of
depending on the storage service to be at hands it's better to make
db::view require the proxy. For now -- via global instance.
There's one dependency on storage service left after this patch --
to get the tokens. This piece is to be fixed later.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
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