[x11-themes/sabayon-artwork-gnome] add GDM distro logo
[x11-misc/lightdm-base] fixup default user, set to root
[x11-misc/lightdm-base] depend against app-admin/eselect-lightdm
[app-misc/sabayonlive-tools] version bump, add LightDM support
[x11-misc/lightdm-gtk-greeter] add eselect-lightdm support