Release of libvirt-4.8.0
Release of libvirt-4.8.0

Signed-off-by: Daniel Veillard <veillard@redhat.com>

- docs/news.xml: updated for release

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