Add Option to Create Vagrant Box for Local Development with MAAS Image

[andar1an]

I want to start this PR to add functionality for Ubuntu Images to create a Vagrant box instead of an image for local development using the same image one will later use in MAAS.

This first line is to begin a discussion, as I can either create a new file or update the existing files and make commands.

I am new to Vagrant and help to decide the best method would be wonderful if this is seen as a useful update.

Thank you

[andar1an]

I have tried to use the same pkr.hcl file, and launch vagrant with the lubvirt provider plugin to minimize work, however I come across permission issues connecting to libvert sockets, and adding my user to libvert or libvert-qemu groups does not solve.

Steps I took were:

`sudo apt install libvirt-daemon-system`
`sudo systemctl start libvirtd`
`sudo systemctl enable libvirtd`
`sudo apt install libvirt-dev`

`vagrant plugin install vagrant-libvirt`

And then run vagrant up with this provider:

`vagrant up --provider=libvirt`

Working on a separate VirtualBox file now.

[andar1an]

I found this repo and this article

It looks like I may be able to use MAAS images in a virtual MAAS environment which means I don't need to create VirtualBox images for Vagrant after all!

Closing this PR now, as it seems to not be relevant. Cam reopen in future if I fail with above resources.