need efi boot support per subtype (system)

[oxedions]

Need to add efi PXE boot support, as described in RHEL 7 documentation (shim.efi, and MAC address grub.cfg-xx-xx... process).

[oxedions]

Need to catch files for specific systems.
For example, get pxelinux.0 and shim.efi for Centos, and different ones for Fedora, etc, for each version.
Also, must try to get latest version... Don't really know how today.