Clean up mbeans that return Internal Cassandra types
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                 Key: CASSANDRA-2805
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2805
             Project: Cassandra
          Issue Type: Bug
    Affects Versions: 0.8.1
            Reporter: Nick Bailey
            Priority: Minor
             Fix For: 0.8.2


We need to clean up wherever we return internal cassandra objects over jmx. 
Namely CompactionInfo objects as well as Tokens. There may be a few other 
examples.

This is bad for two reasons

1. You have to load the cassandra jar when querying these mbeans, which sucks.
2. Stuff breaks between versions when things are moved. For example, 
CASSANDRA-1610 moves the compaction related classes around. Any code querying 
those jmx mbeans in 0.8.0 is now broken in 0.8.1.

For things like CompactionInfo we should just expose more mbean methods or 
serialize to something standard like json.

I'd like to target this for 0.8.2. Since we've already broken compatibility 
between 0.8.0 and 0.8.1, I'd say just fix this everywhere now.

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