HBASE-10745 Access ShutdownHook#fsShutdownHooks should be synchronized

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HBASE-10741 Deprecate HTablePool and HTableFactory

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HBASE-10549 When there is a hole, LoadIncrementalHFiles will hang in an infinite loop.(yuanxinen)

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HBASE-10751 TestHRegion testWritesWhileScanning occasional fail since HBASE-10514 went in

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HBASE-10740 Upgrade zookeeper to 3.4.6 release (Ted Yu)

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HBASE-10749 CellComparator.compareStatic() compares type wrongly (Ramkrishna S. Vasudevan)

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Revert HBASE-10549 When there is a hole, LoadIncrementalHFiles will hang in an infinite loop

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HBASE-10706 Disable writeToWal in tests where possible

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