[PATCH] Remove driverdisk --type

[Chris Lumens <clumens redhat com>]

Since we switched to using the real mount for mounting filesystems, we no
longer need the driverdisk --type option.  In pykickstart and stage2, it
would be easy to deprecate these options.  However, I do not know of a
good way to do that using popt in loader.  Perhaps we can just get away
with removing it entirely since it's probably not a very commonly used
option.

- Chris