Expose more configurability

[nwmcsween]

An example is using DNSMasq which allows tagging based on DHCP options and the workflow of booting iPXE then running a http based ipxe script if the DHCP ipxe vendor class is set.

If this is possible now let me know.

[nwmcsween]

e.g.
--dhcp-match=set:efibc,option:client-arch,7 --dhcp-boot=tag:efibc,ipxe.efi --dhcp-match=set:efi64,option:client-arch,9 --dhcp-boot=tag:efi64,ipxe.efi --dhcp-userclass=set:ipxe,iPXE --dhcp-boot=tag:ipxe,http://foo.bar/boot.ipxe