tests, multus: Add integration test for bridge CNI MAC spoof check
tests, multus: Add integration test for bridge CNI MAC spoof check

Bridge CNI now supports MAC spoof check feature, which permits outbound
communication only to MAC addresses it knows.
In our context, with this feature enabled - a VM connected to a bridge CNI
can only send data through it - if its MAC address hasn't changed from
its initialization (supplied by the user or by the system).

Note: The NetworkAttachmentDefinition used in the test uses 'cnv-bridge'
(deployed by CNAO), since containernetworking plugins haven't yet released it.

Signed-off-by: Orel Misan <f4f6b9e05536108303baf036711b7644c4928f7b@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt