Comment 2 for bug 1772612

Reviewed: https://review.opencontrail.org/43209
Committed: http://github.com/Juniper/nova/commit/8496d4eae14abc532cf47d4423d336a2b35df46e
Submitter: Zuul (<email address hidden>)
Branch: contrail/ocata-15.0.6

commit 8496d4eae14abc532cf47d4423d336a2b35df46e
Author: Jan Gutter <email address hidden>
Date: Tue May 22 11:00:40 2018 +0200

Add plumbing for hardware offloads

* This change expands the VNIC type support for the vrouter VIF type by
adding 'direct' and 'virtio-forwarder' plugging support.

* After this change, the vrouter VIF type will support the following three
modes:
* 'normal': the 'classic' tap-style VNIC plugged into the instance,
* 'direct': a PCI Virtual Function is passed through to the instance,
* 'virtio-forwarder': a PCI Virtual Function is proxied to the
instance via a vhost-user virtio forwarder.

* The libvirt xml generation code was updated to support the modes.

* The Nova legacy VIF plugging code was updated to support the modes.

* The corresponding review on OpenContrail is currently at:
https://review.opencontrail.org/#/c/42850/ for master
https://review.opencontrail.org/#/c/42478/ for 4.1

Change-Id: I73908368d48b0c6f8780b8dabe30b83875efa0b8
Closes-Bug: #1772612
Signed-off-by: Jan Gutter <email address hidden>