[oe] QA for intentionally unpackaged files

[Junqian Gordon Xu]

Koen Kooi wrote:
> Or we could patch package.bbclass[1] to do:
>
> PACKAGES += "${PN}-leftovers"
> FILES_${PN}-leftovers = "/"
>
> I'm not sure if that works, but if it does, we would be able to spot leftovers more easily
> by looking at deploy.

Again, how do you know which one is "intentionally" left-over vs. which 
one is not?

Gordon