Chengw/compact keys #1
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This PR introduces a new tool called nodetool forcecompact. The syntax of the command is
nodetool forcecompact keyspace table .
One of the use cases of the tool is to handle the bad partitions which may contain too many tombstones. The tool will compact all the sstables contain the partition keys. In addition, by ignoring the gc_grace_seconds, it will help purge the tombstones faster.