Revert "hardware offload support for openvswitch"

This reverts commit f39c1a1615.

As it turned out during nova review for the feature [1], we can avoid a
separate vif type, reusing the normal one. This patch drops the type
added in the previous library release.

In theory, it's not backwards compatible, but since there is probably
little adoption for the last library release, and especially for the
new type (I would be surprised to learn anyone started using it), I
think it's ok to drop it and pretend it never happened.

[1] https://review.openstack.org/#/c/398265/

Related-Bug: #1627987

Change-Id: Ic1ee2cd4b0c75b2d0fe5f672e18b9e6206bb7f41

neutron_lib/api/definitions/portbindings.py

@@ -87,10 +87,6 @@ VIF_TYPE_BINDING_FAILED = 'binding_failed'
 VIF_TYPE_DISTRIBUTED = 'distributed'
 VIF_TYPE_OVS = 'ovs'
 VIF_TYPE_BRIDGE = 'bridge'
-# - ovs-acceleration: The ovs acceleration interface type is a SR-IOV hostdev
-#                     interface which support switchdev mode provided by
-#                     kernel 4.8.
-VIF_TYPE_OVS_ACCELERATION = 'ovs_acceleration'
 VIF_TYPE_OTHER = 'other'
 VIF_TYPE_TAP = 'tap'
 # vif_type_macvtap: Tells Nova that the macvtap vif_driver should be used to

releasenotes/notes/add_vif_type_ovs_acceleration-0f983fa70c6d7519.yaml

@@ -1,3 +0,0 @@
----
-features:
-  - Add new vif type ``VIF_TYPE_OVS_ACCELERATION`` to portbindings.