Use new facade for OVO objects
Use new facade for OVO objects

This is to accommodate for neutron plugin code issuing callbacks from
under new facade contexts.

Depends-On: I15ec238c18a464f977f7d1079605b82965052311
Change-Id: Ie4ad57f6357c59f2a978467099642b08e730133e
Closes-Bug: #1746996

openstack/networking-bagpipe-l2,openstack/networking-bagpipe,stackforge/networking-bagpipe-l2,openstack/networking-bagpipe-l2,openstack/networking-bagpipe,stackforge/networking-bagpipe-l2