qemu: drop QEMU_MIGRATION_COMPLETED_UPDATE_STATS
qemu: drop QEMU_MIGRATION_COMPLETED_UPDATE_STATS

This way we get stats only in one place. The former code waits for
complete/postcopy status basically and don't need to mess with stats.

The patch drops raising an error on stats updates failure. This
does not make much sense anyway.

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

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