qemu: save image: Add possibility to return XML stored in the image
qemu: save image: Add possibility to return XML stored in the image

Add a new parameter that will allow to return the XML stored in the save
image for further manipulation and adjust the callers. This option will
be used in later patches.

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