Remove hw_video_model and hw_firmware_type from metadata
Remove hw_video_model and hw_firmware_type from metadata

Starting with the Openstack Queens release,
hw_firmware_type=uefi is implied on AArch64 by default
Using virtio-video, now default in nova, should be used
instead of VGA

JIRA: ARMBAND-388

Change-Id: I393093c5a1a9dd9c8259b3987db22650313cf249
Signed-off-by: Delia Popescu <07e7c835febbe1eb964423ba1261e99da10fe250@enea.com>

opnfv/functest,opnfv/functest