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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.

This sets mac address using ip set link mac.

This can help break ties consistently when multiple events have the same
timestamp.

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

for no_simbricks experiments

This changed a while ago in one of the refactoring steps so some of the scripts
were broken.