Some of the modules listed in list_modules.pm are now configured to be
built-in modules in our current kernels. We should keep them listed in
case the kernel configuration changes again. So don't report them as
bad/old modules when checking.

Get the kernel module list from /lib/modules/<kernel_ver>/modules.dep
instead of looking for a file that is no longer generated. Support an
optional command line parameter to 'modules.pl check' to specify the
kernel version (use the running kernel version if not specified).

Fix the pcitable and usbtable checks. These tables contain module names,
whereas list_modules.pm contains module file names.

The installer needs to have the modules.alias information for more kernel
modules than are actually included. In order to do this we need to use
and environment variable as there is no sensible way to do this via dracut
command line arguments.

The mgainstaller dracut module will need updating accordingly.

This should solve the problem where Sound Cards are shown as
'not configured' at the end of the install.

This removes functions no longer called and adds a new one which will
simply list the desired modules and pass them on the dracut command line.

This should mean we have the same modules as before (at least) which should
mean less regressions.

This does increase the size of the initrd back up quite a lot (as expected)
so we may want to look at optimising other areas to bring it back down a bit
again.

modules as XZ (since kernel now compress them with XZ)

(remove_unneeded_modules) search for .xz extension instead of .gz

(make_modules_per_image) adapt