HBASE-9865 Reused WALEdits in replication may cause RegionServers to go OOM

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HBASE-9956 Remove keyLength cache from KeyValue

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HBASE-9894 remove the inappropriate assert statement in Store.getSplitPoint() (Liang Xie)

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HBASE-9138 getHaseIntegrationTestingUtility() is misspelled

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