- When a separate livefs ISO is used, change the name of the tree directory
to be R/cdrom/livefs and change the name of the iso to livefs.iso rather
than using disc2. Instead, disc2 is now always going to be the packages
disc regardless of the presence of a separate livefs which makes things
simpler.
- Build a very simple disc2 tree under R/cdrom that just includes the
cdrom.inf file that the packages need. Also, build a disc2.iso image
in the iso.1 target. Disc 2's volume label is "FreeBSD_Packages".
- Retire CD_EXTRA_BITS and replace it with CD_PACKAGE_TREE. CD_EXTRA_BITS
was specific to disc1, but CD_PACKAGE_TREE instead should point to a
directory that has disc1 and disc2 subdirectories that contain the extra
bits for each image.
- Rename the bootonly volume label to "FreeBSD_bootonly" and just hardcode
the disc1 and livefs volume names and iso suffixes.
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