add lbaasv2 to NeutronServicePlugins in octavia containers
add lbaasv2 to NeutronServicePlugins in octavia containers

without lbaasv2 neutron will not be able to load the plugin
and communicate with octavia.

Change-Id: If44b93703d3c408ae075d73ed695c3edc58fba18

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates