[CA-147162] sysprep is unhappy about root#xenevtchn in CDDB with std drivers

Signed-off-by: Ben Chalmers <Ben.Chalmers@citrix.com>
Merge pull request #92 from benchalmers/ca147162-2

[CA-147162] sysprep is unhappy about root#xenevtchn in CDDB with std dri...