Description of Problem:
On installs and upgrades, anaconda should remove all stale EFI Boot 
Manager entries that it may have created on previous installs to the same 
system.  Something like:

  for b in `efibootmgr | grep "Red Hat Linux" | awk '{print $1}'`; do 
	efibootmgr -b $b -B
  done

Otherwise, you wind up with multiple entries "Red Hat Linux" in the boot 
manager after installing multiple times.