Only modify oz default unattend files.
Only modify oz default unattend files.

If the user provided an unattend.xml file for Windows 2008 or
Windows 7, use it verbatim rather than modifying parameters.

Signed-off-by: Chris Lalancette <60b62644009db6b194cc0445b64e9b27bb26433a@redhat.com>

NeilBryant/oz,clalancette/oz,mgagne/oz,imcleod/oz,cernops/oz,ndonegan/oz,nullr0ute/oz,NeilBryant/oz,imcleod/oz,moofrank/oz,cernops/oz,nullr0ute/oz,ndonegan/oz,clalancette/oz,mgagne/oz,moofrank/oz