setup-disk says "Not a valid install mode" when no disk is selected

When you select ‘none’ in disk selection you get an error message and script exits with error. Selecting ‘none’ is perfectly legal so no error should be displayed and script should exit with success.

(from redmine: issue id 592, created on 2011-04-27, closed on 2011-05-03)

Changesets:
- Revision ca32c5f76f5281b23fc93b8bc7ff6afdea5d23fc by Natanael Copa on 2011-04-27T13:29:07Z:

setup-disk: don't complain about invalid disk mode when disk is 'none'

and fix help to include LVM option
ref #592

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