HBASE-10511 Add latency percentiles on PerformanceEvaluation

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HBASE-10490 Simplify RpcClient code (Nicolas Liochon)

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HBASE-10472 Manage the interruption in ZKUtil#getData (Nicolas Liochon)

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HBASE-10477 Regression from HBASE-10337 (Nicolas Liochon)

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HBASE-10354. Addendum commit. 10354.add.patch committed

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