Inject expected results for IBM Power when testing bus devices

Same as in https://review.openstack.org/#/c/93621 this patch
inject expected values when the test is running on IBM Power
platform, since the ide bus isn't supported on IBM Power,
and libvirt translate all ide calls directly to scsi
when it's running in power platform

Change-Id: Ibebc96e71a8ba21ae8634e9e22de1cd28f3a7990
Merge "Inject expected results for IBM Power when testing bus devices"