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Impala reserves resources from YARN via Llama and handles resources preemptions by cancelling affected queries. Adds the Impala Resource Broker for interacting with Llama. Refactors scheduler and coordinator to move fragment-to-host assignment logic into scheduler. Local test setup uses MiniLLama. Change-Id: Ic7b0fe43de52d30f4207b4e65cce7e6a294e54e1