if we're in singleop mode, allow the block retrieval queue to use a local prefetch status cache in lieu of the disk block cache
if we're in singleop mode, allow the block retrieval queue to use a local prefetch status cache in lieu of the disk block cache

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client