Comment 2 for bug 2013228

This RFE has been approved with the following comments (see drivers meeting logs):
* Create a SPEC.
* The RFE will propose a new port extension, e.g. hardware_offload, that will replace the port binding definition.
* The feature will be implemented in 2 phases:
** Create the port extension, changes in the SDK/CLI code and Neutron core. But pass to Nova the port binding information as before. That will avoid the need to make any change in the Nova code yet.
** Once implemented, remove the Neutron code that changes the port binding information.