Add SSTable components required by new DSE CFS compaction strategy
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                 Key: CASSANDRA-4049
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4049
             Project: Cassandra
          Issue Type: New Feature
          Components: Core
            Reporter: Piotr Kołaczkowski
            Priority: Minor


CFS compaction strategy coming up in the next DSE release needs to store some 
important information in Tombstones.db and RemovedKeys.db files, one per 
sstable. However, currently Cassandra issues a warnings when these files are 
found in the data directory. Additionally, when switched to 
SizeTieredCompactionStrategy, the files are left in the data directory after 
compaction.

The attached patch adds new components to the Component class so Cassandra 
knows about those files.



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