HBASE-10539 HRegion.addAndGetGlobalMemstoreSize returns previous size

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HBASE-10546 Two scanner objects are open for each hbase map task but only one scanner object is closed. (Vasu Mariyala)

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HBASE-10501 Improve IncreasingToUpperBoundRegionSplitPolicy to avoid too many regions.

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CHANGES.txt for 0.94.17 RC1

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