Description of problem:
Even if an unattend.xml file is requested for the sysprep disk, cnv requires the file autounattend.xml to exist.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Create VM with sysprep disk containing unattend.xml, but not autounattend.xml

Actual results:
VM fails to boot

Expected results:
VM boots if at least unattend.xml or autounattend.xml exists.

Additional info: