remote-viewer: add handling of spice+unix and spice+tls schemes
- spice+unix:// was added in spice-gtk v0.28
- spice+tls:// was added in spice-gtk v0.35
This allows launchers to start remote-viewer when they encounter a
Spice URI with +unix or +tls.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Jonathon Jongsma <jjongsma@redhat.com>
Acked-by: Victor Toso <victortoso@redhat.com>