HBASE-10567 Add overwrite manifest option to ExportSnapshot

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HBASE-10526 Using Cell instead of KeyValue in HFileOutputFormat

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HBASE-10586 hadoop2-compat IPC metric registred twice

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HBASE-10547 TestFixedLengthWrapper#testReadWrite occasionally fails with the IBM JDK

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HBASE-10589 Reduce unnecessary TestRowProcessorEndpoint resource usage

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HBASE-10580: IntegrationTestingUtility#restoreCluster leak resource when running in a mini cluster mode

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