Make unit tests work with os-vif 1.4.0
Make unit tests work with os-vif 1.4.0

The expected VIFHostUser object in this test is setting the
vif_name field on the object which didn't actually exist until
version 1.1 of that object which is being released in os-vif 1.4.0.

The test passes against os-vif 1.3.0 and VIFHostUser 1.0 today
because the obj_to_primitive() routine will not include anything
that's not a field on the object, which is vif_name in this case.

But when moving to os-vif 1.4.0, we're hitting a failure because
the expected object has vif_name set but the actual object doesn't
because though the vif_name field is defined, it's not actually
used yet in the code, so it's not set in the primitive and our
object comparison fails.

Change-Id: I1c27726d583a41ab69d9eab23e8484e7e047942d
Closes-Bug: #1656025

gooddata/openstack-nova,rahulunair/nova,openstack/nova,gooddata/openstack-nova,jianghuaw/nova,vmturbo/nova,rajalokan/nova,mahak/nova,rahulunair/nova,vmturbo/nova,Juniper/nova,phenoxim/nova,hanlind/nova,hanlind/nova,klmitch/nova,vmturbo/nova,gooddata/openstack-nova,mikalstill/nova,Juniper/nova,jianghuaw/nova,openstack/nova,vmturbo/nova,phenoxim/nova,gooddata/openstack-nova,jianghuaw/nova,mahak/nova,rajalokan/nova,Juniper/nova,mikalstill/nova,Juniper/nova,klmitch/nova,rahulunair/nova,hanlind/nova,mikalstill/nova,klmitch/nova,rajalokan/nova,mahak/nova,rajalokan/nova,klmitch/nova,jianghuaw/nova,openstack/nova