Fix wrong mountpoint display and wrong partition type, by setting mountpoint explicit to - (as required for FAI)

Forward port revision 13742

Applying fix for Trac #2090 from Sebastian Harl

- Fix wrong mountpoint display and wrong partition type,
by setting mountpoint explicit to - (as required for FAI)
- Fix undo of preserve Flag by setting FAIpartitionFlags to
" " explicit

(from redmine: issue id 1171, created on 2012-07-20, closed on 2012-11-30)

Changesets:
- Revision 9d6c326c by Benoit MORTIER on 2012-07-20T16:35:57.000Z:

Fixes: #1171 Fix wrong mountpoint display and wrong partition type, by setting mountpoint explicit to - (as required for FAI)

Custom Fields:
- Bug in version: 1.0.4