docs: Add QEMU-GA get hostname feature into news.xml
docs: Add QEMU-GA get hostname feature into news.xml

QEMU-GA supports get geust hostname command. This commit includes a
specific entry to inform this new feature for QEMU driver to 4.8.0
release.

Signed-off-by: Julio Faracco <a9e27ab562b8d02c0041eb70cde6fe3858219fb7@gmail.com>
Reviewed-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

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