remove more copies from read/write network path
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                 Key: CASSANDRA-3333
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3333
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Jonathan Ellis
            Assignee: Jonathan Ellis
            Priority: Minor
             Fix For: 1.0.1


RowMutation.serializedBuffer and ReadVerbHandler both do an extra copy of the 
serialized data. We can avoid this be pre-computing the serialized size and 
allocating an appropriate buffer.

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