HBASE-8425 Per-region memstore size is missing in the new RS web UI

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HBASE-8456 HBase Windows scripts fail when there's a blank space in JAVA_HOME (Mostafa Elhemali)

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HBASE-8453. TestImportExport failing again due to configuration issues

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HBASE-8454. TestImportTsv failing due to configuration issues

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HBASE-8448 RatioBasedCompactionPolicy (and derived ones) can select already-compacting files for compaction

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