HBASE-10737 HConnectionImplementation should stop RpcClient on close

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HBASE-10476 HBase Master log grows very fast after stopped hadoop (due to connection exception) (Demai Ni)

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HBASE-10738 AssignmentManager should shut down executors on stop

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HBASE-10514 Forward port HBASE-10466, possible data loss when failed flushes

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HBASE-10739 RS web UI NPE if master shuts down sooner

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HBASE-10744 AM#CloseRegion no need to retry on FailedServerException

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