Description of problem:
Currently, the UEFI efidefault menu lists all the same distros SYSLINUX' beaker_menu has.  It doesn't appear to be possible to structure the efidefault menu with submenus/trees as with SYSLINUX.  This makes selecting a desired OS cumbersome when provisioning over a console connection.

Version-Release number of selected component (if applicable):
All

How reproducible:
Every time

Steps to Reproduce:
1. Boot system set in DHCP to use grub efi bootloader
2. See huge list of distros.  Some of which aren't UEFI-compatible
3. Spend minutes holding down the arrow key until you see your desired OS

Actual results:
All imported distros are listed in efidefault menu

Expected results:
Only distros compatible with UEFI booting would be listed (RHEL6, RHEL7, and Fedora18+)

A possible solution to this would be to add some code to pxemenu.py to only manage applicable distros in the efidefault menu.

Additional info: