Based on patch adding support of vif_plug from:

• nova-specs: https://review.openstack.org/162468
• nova: https://review.openstack.org/162470
• neutron: https://review.openstack.org/162471

1. install vif_plug_script

cp vif_ovs_plug_script.py /usr/bin mkdir /etc/nova_vif_ovs_plug/ cp -a rootwrap/* /etc/nova_vif_ovs_plug/.

2. configure neutron

Add to /etc/neutron/neutron.conf in [DEFAULT] section: vif_plugin_script = vif_ovs_plug_script.py