The NSX|V will support a direct vnic type iff this port meets the
following criteria:
1. no security groups
2. no port security
3. is on a VLAN/FLAT network
The reason for this is that the direct is only support via the DVS
and there is no support for security groups and port security.
Change-Id: Iff4cc72e724d40feff2b26fc4f24596cae3a749a