HBASE-9575 Add script to automate much of the rc-making process

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HBASE-9364 Get request with multiple columns returns partial results

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HBASE-9153: Introduce/update a script to generate jdiff reports

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HBASE-9551: HBaseTestingUtility#createPreSplitLoadTestTable double close HBaseAdmin

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HBASE-9534: Short-Circuit Coprocessor HTable access when on the same server (Jesse)

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HBASE-9581: Few tests broken since HBASE-9551

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