Add a VirtViewerDisplayVte display kind
This is not a graphical display, so the application will have to deal
with it with care.
You may argue that we need a large refactoring to introduce a more
generic "console" object, that could be either graphical or textual.
For now, this does work well enough for me.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Victor Toso <victortoso@redhat.com>