Let's major compact the smallest tables first, increasing chances of
success if low on disk space.
parallel_for_each() didn't have any effect on space requirement as
compaction_manager serializes major compaction in a shard.
As parallel_for_each() is no longer used, find_column_family() is now
used before each compact_all_sstables() to avoid a race with table drop.
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
Message-Id: <20211005135257.31931-1-raphaelsc@scylladb.com>
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