Description of problem:
Direct passthrough of physical networking devices and SR-IOV virtual functions.
* Includes requirement for neutron to have an understanding of which external networks each device is connected to.
* Includes requirement for nova scheduler to have an understanding of incoming instance network requirements and how they map to those external networks and devices.
* Includes requirement to be able to mix and match, some virtio networking devices (typically management interface) and some direct passthrough. Single instance may have a virtio management device and two or more passed through devices connected to different internal or external networks.
Devices: Intel 82599