Guest has to be prepared for running with qlx
driver. Drivers have to be properly installed
before starting of the test. Otherwise the test
could FAIL.
tests steps:
    1) starts windows XP guest on first host
    2) try login to guest
    3) starts presubtest steps with
       stepsfile = WinXP-set-VGA-mode.steps
       enable VGA mode on GPU
    4) after presubtest finished starts migration
       to host2
    5) after migration starts postsubtests with
       stepfile = WinXP-reset-VGA-mode.steps
Signed-off-by: NJiří Župka <jzupka@redhat.com>