Add makefile support for taking a FreeBSD fixit disk and turning that
into a testbed boot CD in a mostly automated manner. There are still a few things that need to be done by hand, which are described in the cdboot/README file. Add tmcd/freebsd/cdboot directory of little scripts and files that need to onto the fixit disk. The install target is cdboot-install (must be run as root) and if you are brave enough to run it, you better give it a DESTDIR argument or you will write a bunch of files onto the local node that will cause mayhem and havoc at the next reboot.