Improve bookie performance for large number of ledgers

                 Key: ZOOKEEPER-486
             Project: Zookeeper
          Issue Type: Improvement
          Components: contrib-bookkeeper
            Reporter: Flavio Paiva Junqueira

If we write simultaneously to a large number of ledgers on a bookie, then 
performance drops significantly due to more seeks on the ledger device. In such 
cases, we should be clustering ledgers into files to reduce the number of 
seeks, and performing sequential writes on each file. Clustering ledgers will 
impact read performance, so we would to have a knob to control such a feature.

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