[oe] Merging multimachine.bbclass into the OE.dev core

[Koen Kooi]

Richard Purdie wrote:
> Hi,
>
> multimachine has been a kind of second class citizen for a long time
> having been maintained in its own class.  We now have things like sdk
> generation which implicitly depend on multimachine being used. I can't
> think of any reason people wouldn't want to use it and it allows extra
> flexibility without imposing any added limitations.
>
> Is it time we merged it into the core classes and made it the default?

Yes!

regards,

Koen