HBASE-9796 npe in RegionServerCallable

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HBASE-9798 Include dependency hamcrest-core

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HBASE-9793 Offline a region before it's closed could cause double assignment

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HBASE-9747 added test (Aditya Kishore)

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HBASE-9768 Two issues in AsyncProcess

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HBASE-9786 hbck -metaonly incorrectly reports inconsistent regions after HBASE-9698 fix

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HBASE-9784 Switch to Hadoop-2.2

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