conf: numa: Refactor logic in virDomainNumatuneParseXML
conf: numa: Refactor logic in virDomainNumatuneParseXML

Shuffling around the logic will allow to simplify the code quite a bit.
As an additional bonus the change in the logic now reports an error if
automatic placement is selected and individual placement is configured.

datto/libvirt,libvirt/libvirt,taget/libvirt,datto/libvirt,jfehlig/libvirt,taget/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,shugaoye/libvirt,nertpinx/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,zippy2/libvirt,agx/libvirt,shugaoye/libvirt,agx/libvirt,eskultety/libvirt,fabianfreyer/libvirt,eskultety/libvirt,jfehlig/libvirt,jfehlig/libvirt,datto/libvirt,rlaager/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,datto/libvirt,libvirt/libvirt,VenkatDatta/libvirt,eskultety/libvirt,agx/libvirt,olafhering/libvirt,olafhering/libvirt,nertpinx/libvirt,rlaager/libvirt,olafhering/libvirt,taget/libvirt,crobinso/libvirt,nertpinx/libvirt,jardasgit/libvirt,zippy2/libvirt,agx/libvirt,eskultety/libvirt,crobinso/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,agx/libvirt,jardasgit/libvirt,jardasgit/libvirt,rlaager/libvirt,eskultety/libvirt,shugaoye/libvirt,rlaager/libvirt,zippy2/libvirt,taget/libvirt,libvirt/libvirt,crobinso/libvirt,rlaager/libvirt,fabianfreyer/libvirt,libvirt/libvirt,jardasgit/libvirt,olafhering/libvirt,zippy2/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,shugaoye/libvirt,datto/libvirt,taget/libvirt,jardasgit/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,jfehlig/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,crobinso/libvirt