src/xenxs: Refactor code parsing PCI config
src/xenxs: Refactor code parsing PCI config

introduce function
   xenParseXMPCI(virConfPtr conf, ........);
which parses PCI config instead

Signed-off-by: Kiarie Kahurani <c9add1accb912784264f310f617467d4c47149ea@gmail.com>

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