When setting parameters revolving around boot
mode, options, firmware, it is necessary to
extract and edit the XML document.
Some details, however, are not automatically
extracted and libvirt must be told to provide
secure information. This change prevents us
from accidently loosing such configuration
parameters
Story: 2010382
Task: 46651
Change-Id: I0da2f37c5b630d2a180f59b74f23c027ee56e17b