Fix Findbugs: Condition misuse
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                 Key: CASSANDRA-612
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-612
             Project: Cassandra
          Issue Type: Bug
            Reporter: Stu Hood
         Attachments: await.txt

We frequently misuse Condition objects, although there is no guarantee that all 
of the uses are abuses.

On the other hand, findbugs did find two issues that are likely to be bugs: not 
checking the return value of await(timeout), and calling wait() rather than 
await() on a Condition. See the attached.

In order to find unused method parameters for CASSANDRA-608, I ran FindBugs 
against Cassandra, and found a few interesting issues we ought to explore (but 
not the unused method params, oi.)

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