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This change makes few compromises: * Looks up the devices associated with tasks at look up time. Given that `nomad alloc status` is called rarely generally (compared to stats telemetry and general job reporting), it seems fine. However, the lookup overhead grows bounded by number of `tasks x total-host-devices`, which can be significant. * `client.Client` performs the task devices->statistics lookup. It passes self to alloc/task runners so they can look up the device statistics allocated to them. * Currently alloc/task runners are responsible for constructing the entire RPC response for stats * The alternatives for making task runners device statistics aware don't seem appealing (e.g. having task runners contain reference to hostStats) * On the alloc aggregation resource usage, I did a naive merging of task device statistics. * Personally, I question the value of such aggregation, compared to costs of struct duplication and bloating the response - but opted to be consistent in the API. * With naive concatination, device instances from a single device group used by separate tasks in the alloc, would be aggregated in two separate device group statistics.