qemu: Store completed stats at the very end of migration
qemu: Store completed stats at the very end of migration

Statistics for a completed migration only make sense if the migration
was successful. Let's not store them in priv->job.completed until we
are sure it was a success.

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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