kvm tools: Initialize and use VESA and VNC

kvm tools: Initialize and use VESA and VNC

Requirements - Kernel compiled with:
CONFIG_FB_BOOT_VESA_SUPPORT=y
CONFIG_FB_VESA=y
CONFIG_FRAMEBUFFER_CONSOLE=y

Start VNC server by starting kvm tools with "--vnc".
Connect to the VNC server by running: "vncviewer :0".

Since there is no support for input devices at this time,
it may be useful starting kvm tools with an additional
' -p "console=ttyS0" ' parameter so that it would be possible
to use a serial console alongside with a graphic one.

Signed-off-by: John Floren <john@jfloren.net>
[ turning code into patches and cleanup ]
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>