1n-tx2 needs new i40e and iavf drivers, otherwise VF creation gets
stuck. With these new drivers, VPP AVF interfaces cannot be created
becasue of VPP-1995.
Disable the tests until the appropriate fix is present in (a newer
version of) i40e drivers.
Change-Id: I3ac5d3d7a677a696477c2766291f371df4a7b903 Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>