allow to config port binding:profile

When using OVS HW offload feature we need to create
neutron port with  --binding-profile '{"capabilities": ["switchdev"]}' [1]
To allow this feature to be tested with Mellanox CI we need a way
to configure the port binding:profile in tempest

[1] - https://review.openstack.org/#/c/504911/

Change-Id: I9b562aaabf960d38f623d88e8b88619edbb70fe8
3 files changed