HBASE-8031 Document for hbase.rpc.timeout

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HBASE-8045 Fix .META. migration after HBASE-3171

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HBASE-8289  TestThreads#testSleepWithoutInterrupt should not expect a bounded wait time

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HBASE-8290  TestHTableMultiplexer is flaky

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HBASE-7247  Assignment performances decreased by 50% because of regionserver.OpenRegionHandler#tickleOpening

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