The installation from DVD on s390x needs setting the target disks and
network information that are usually set by editing the generic.prm file.
By including the "rd.cmdline=ask" parameter dracut will open a simple
dialog so the user can enter the required information.
Resolves: rhbz#1132050
(cherry picked from commit e92ea26206)
move arch-specific stuff to arch-specific subdirs and move all the
common stuff to a subdir named 'common'. Also, rename '.profile' and
'.bash_history' so you actually see them when you 'ls' the 'common' dir.
also added some helpful(?) comments to the templates.