Update document to explain `make build` for libvirt about sunder HOT 5 CLOSED

I remember the steps from SecureDrop work, just want to make sure that we document these for the next person :)

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@garrettr Docker is fine for this. I just to make sure that any new contributor (or someone just poking into things) can start smooth.

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Good call, @kushaldas. You'll need to pull the VirtualBox image, the convert it to libvirt, since there's no official build of libvirt as far back as Trusty:

$ vagrant box add ubuntu/trusty64
$ vagrant mutate ubuntu/trusty64 libvirt

Then try vagrant up again. Note #75, which should sidestep problems like what you describe on all platforms.

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@kushaldas Are you comfortable using Docker? Because we're considering moving away from Vagrant/Ansible to Docker for Linux builds in #75.

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Superseded by #87: we no longer use Vagrant/libvirt, we use Docker containers for building the Linux Debian packages.

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