machine placement spec tweak

[Gustavo Niemeyer]

> How I'm actually working on this, it suddenly seems like a huge
> oversight that we haven't got a constraint something like:
>
>    arch=x86|x64|arm

Oh, indeed! I'm pretty sure we actually debated this at UDS.

Please use amd64/386/arm

> ...and I don't recall really discussing it (well, I remember us deciding
> that we should just go with ECU, and that makes sense as far as it goes,
> but architecture seems pretty fundamental too, and I'm not sure it got
> the discussion it deserved).

Yeah, we've been postponing the introduction of architecture precisely
because it was just another constraint in principle. We'll need to worry
about other details later regarding the charm itself, but this is the basis.

> I'm not proposing we change the spec right now, but it shouldn't be too

I suggest we do change it.

-- 
Gustavo Niemeyer
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-- I'm not absolutely sure of anything.