In I77650be5f04775a72e2bdf694f93988825a84b72 we added
vnic_type direct to the ovs mechanism drivers supported
vnic_types. This cause problems when working with ovs and sriovnicswitch
mechanism drivers in that order. In this case the ovs will bind
the direct port instead of the sriovnicswitch.
This change make ovs mech driver to bind the direct port only
if user requested --binding-profile '{"capabilities": ["switchdev"]}'
in the direct port if a user don't request this capability the SR-IOV
legacy NIC mode is used.
When enable-sriov-nic-features will be implemented in nova and
libvirt will expose the switchdev capability then nova will be
able to select a host which supports SR-IOV nic with switchdev
mode.
[1] - https://review.openstack.org/#/c/435954/11/specs/pike/approved/enable-sriov-nic-features.rst
[2] - https://www.redhat.com/archives/libvir-list/2017-August/msg00583.html
Closes-Bug: #1713590
Change-Id: I0b5f062bcbf02381bdf4f694fc039f9bb17a2db5
b184558ab6