Bug#447755: s390 installer doesn't support CMS minidisks; tries to mount partitions in wrong order

[Stephen Powell <zlinuxman@wowway.com>]

I just tried a new Lenny install from scratch on the s390 architecture,
with one of the disks pre-formatted
in ldl format.  (Of course I told the Debian installer not to format it.)
When I got to the "partition disks" step, the implicit partition present on
that disk was recognized and I was able to assign a mount point to it and
complete the install.  This makes me optimistic that read-only support for
CMS-formatted disks (reserved and non-reserved) in parted may be all that is
needed to support CMS-formatted disks in the Debian installer.  The installer
itself may not need to be changed.