Chainload ipxe script via PXE

[NiKiZe]

pxelinux.cfg are usually used with pxelinux, which is not iPXE

If you general.h was missing support for any protocol you would see different errors, normally you keep config/general.h unchanged, and only add what you really need to change into config/local/general.h

When troubleshooting - always use tcpdump, wireshark or other tool to see the packets and what is going on.
I would change to just do an imgfetch, followed by imgstat,
and than chain macaddress

if the filename is the same for both than the last chain will load from local "cache"
but imgstat will show filesize etc.

I also want to stress that iPXE does not use config files, but rather scripts, which helps make it easier to understand what is going on.
debugging is enabled with the DEBUG= flags during compile.

to diagnose scripts, build with DEBUG=script