We have a commented code snippet from Origin with cleanup and a FIXME to
implement it. Origin flushes the memtables and kicks a compaction. We
only implement the flush here -- the flush will trigger a compaction
check and we leave it up to the compaction manager to decide when a
compaction is worthwhile.
This method used to be called only from unbootstrap, so a cleanup was
not really needed. Now it is also called at the end of repair, if the
table is using repair-based tombstone-gc. If the memtable is filled with
tombstones, this can add a lot of time to the runtime of each repair. So
flush the memtable at the end, so the tombstones can be purged (they
aren't purged from memtables yet).
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