Bug#358638: netboot: better support for multiple arches

[Otavio Salvador <otavio@debian.org>]

Hello Martin,

I'm using, here in O.S. Systems, the digress and we do support for
more then one arch like the official dilab does. Here we solved the
problem using the arch in prefix. I'm posting a dhcp configuration for
reference:

        group {
                next-server lab.ossystems.com.br;

                host test01 {
                        hardware ethernet 00:0b:6a:09:36:79;
                        fixed-address 10.1.0.240;
                        ddns-hostname "test01";
                        filename "test01/pxelinux.0";
                }
        }

As you can see, we use hostname as prefix but you could use the arch
if you have just one installer for all your machines.

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