Make sure grub2-efi-*-cdboot is included in the live media kickstart,
add some documentation about creating UEFI disk images, and add ia32 to
the minimal example (it will need to be commented out for other arches).
Resolves: rhbz#1458937
systemd uses /var/lib/systemd/random-seed to add entropy to /dev/urandom
at boot time. During image creation this file is created, and if not
removed everything using the image will be adding the same seed.
This is only additional entropy, NOT a seed in the sense of a starting
point for a PRNG, so it will be mixed with other entropy as the system
runs. It isn't a good idea to use the same value everywhere so make sure
it is removed in %post
Resolves: rhbz#1258986
Also adds a check for a bad url repo, and fix ram calculation for
appliance mode. Updates the README.livemedia-creator documentation.
Resolves: rhbz#1019728
