"
In a few places, the only use we had for a subscription was calling
done(). With this series we now call done() early and store the
future<> instead.
"
* 'espindola/stream-cleanup' of https://github.com/espindola/scylla:
sstable_test: Store a future<> instead of a subscription
commitlog: Store a future instead of a subscription in db::commitlog::segment_manager::list_descriptors::helper
lister: Store a future<> instead of a subscription
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