Fixing dhcp-boot filepath

[atomar94]

The dhcp-boot filepath should be ./ipxe/netboot.xyz.kpxe but is currently netboot.xyz.kpxe.

If you build the netboot project you will generate a folder structure like this.

menu.ipxe
version.ipxe
...
ipxe/
  netboot.xyz.kpxe

We want to mount this folder structure as-is.