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Currently sequence number is printed signed, while gem5 prints it unsigned as
it should be.

Previously we were calling completions etc. directly, but then the
prioritization does not match what gem5 does. This is slightly slower, but we
want to match gem5 exactly here.

Also splits out arg parsing from running so code can use the mac address in
initializationg before calling run.

Fix up behavioral nic simulators to compile and link again.