full-test: Start of a full testing suite.

full-test.sh aims to be a test suite generator for the boot loader. It
tries to grab artifacts from the web and then constructs minimal boot
environments from that as well as writing qemu-system-* using scripts
that facilitates testing all the ways we can boot... At least all the
ways that we an boot that qemu can emulate.

This is very much a work in progress, and likely could use a good
cleanup at some point.

Sponsored by: Netflix