Add support for 2 other built boxes, and other changes: - The 2 other boxes only have enough installed on them to allow them to work as a vagrant host. (vagrant user, etc.) - Use roboxes/ubuntu2204 as the vagrant vm for testing, instead of hashicorp/bionic64 - Add the gem for the vagrant plugin vagrant-vbguest. It's abandoned, and there was a minor bug in it. - Other minor updates, see Changes.