Use plugin directory fixture
Use plugin directory fixture

This patch resolves the pending TODO.

Change-Id: Ic2b2c402756782af239d60d28cf5059239533ab6

eayunstack/neutron,mahak/neutron,huntxu/neutron,openstack/neutron,huntxu/neutron,openstack/neutron,noironetworks/neutron,noironetworks/neutron,mahak/neutron,openstack/neutron,mahak/neutron,eayunstack/neutron