Create a nodetool upgrade_sstables to avoid using scrubs for tasks it wasn't 
intended to.
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                 Key: CASSANDRA-3406
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3406
             Project: Cassandra
          Issue Type: New Feature
          Components: Core
    Affects Versions: 1.0.0
            Reporter: Sylvain Lebresne
            Assignee: Sylvain Lebresne
            Priority: Trivial
             Fix For: 1.0.2


Scrub was intended to check a data file is not corrupted and to try to correct 
some form of corruption and discard the data when it can't repair. But we are 
now using it also for:
* major upgrade, to have sstable in the new data format for streaming sake 
(that one could be "fixed" independently by supporting old format during 
streaming)
* to force the compaction of existing sstables after changing the compression 
algorithm

We should probably provide a separate tool/command for those two last tasks 
since:
* we could have a better name, like upgrade_sstables or rewrite_sstables for 
that operation
* we could avoid the automatic snapshot that scrub does (and is not expected by 
users for those operations)
* make it slightly quicker/simpler by avoiding the corruption detection code

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