To make it available, we'll need to make it optional the usage of level metadata,
used to deal with interval map's fragmentation issue when level 0 falls behind,
and also introduce a interface for compaction strategies to implement
make_sstable_set() that instantiate partitioned sstable set.
Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
Message-Id: <20190424232948.668-1-raphaelsc@scylladb.com>