HBASE-10537 Let the ExportSnapshot mapper fail and retry on error

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HBASE-10419 Add multiget support to PerformanceEvaluation

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HBASE-10534 Rowkey in TsvImporterTextMapper initializing with wrong length(Rajesh)

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HBASE-10570 Allow overrides of Surefire secondPartForkMode and testFailureIgnore

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