nomodeset no long does anything helpful, and inst.text doesn't make sense
with a live image so drop the menu from the live image.
Related: rhbz#1961092
Seems petitboot can't properly parse the live image grub config on ppc, thus
booting fails on bare-metal. Fix the problem by removing the obsolete 32-bit
entries.
When using the template install command copying the same file to itself
shouldn't crash. Just log the error and continue.
Also copy the s390 configuration files for use with livemedia-creator
Resolves: rhbz#1269213