On Liberty aarch64, enable vnc using vga driver disabling usb input.
Liberty didn't seem to like the disable_vnc flag to Nova on aarch64 that we relied on so that images would boot. Fortuitously, qemu/libvirt have been upgraded enough so that you can actually attach a VGA adapter to an aarch64 KVM qemu instance. So we do that, and now we mark images with a specific flag that says to use the vga display driver instead of the 'cirrus' default, which qemu/libvirt aarch64 does *not* support. Probably I should just find a way to fix the vnc disablement :).
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