Adds test for mac_spoofing

Test that MAC spoofing is enforced by Neutron security-groups and allowed when
port-security flag is turned off.

Enhances several helper functions to support multiple NICs

Partially Implements: blueprint ml2-ovs-portsecurity

Change-Id: Idc7e733a19f926894050db012efbd7a10f08c011
5 files changed