Code review comment for lp://staging/~jtv/maas-test/require-sudo

Nice! Thanks for the RETURN_CODES cleanup.

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> In the longer term, of course, it will bit-rot and we might as well start getting rid of it.

I don't see us changing our minds about this, we might as well get rid of the 'sudo' invocations. But that's a cleanup better done later.