[syslinux] Recursive pxelinux.0 and pxelinux.cfg directories.

[Vance Turner]

What I am setting up is an automatic install environment at Datadomain.
So that the X86 class machines will be loaded unattended from any number
of OS types or revisions. I will have all of the systems enabled with
LOM (Lights Out Management ) capabilities. For now I am going to use
network booting, but ultimately I will set up a Solaris system with a
directory structure and be able to link the directory structure to iSCSI
targets. This way I can take the systems down via LOM, have the master
system reset the iSCSI target to the proper OS, Applications, and
Patches, then reboot the system for the automated test to be run. I want
to cut my current 45min period between OS loads down to 5 at the max.

I also want to hand off the network boot server to corporate to handle
interactive and non-interactive loads of all supported OS
configurations.

I can do this with one convoluted /tftpboot directory, but I would like
to have a uniform entry point to pick the OS type, then go to a menu of
releases for that type, then had it of to the default menus and splash
screens the vendors provide.

I am willing to publish this to the net later as an example.