Add puppet_config to docker neutron-l3 service
Add puppet_config to docker neutron-l3 service

This patch makes the neutron-l3 docker service adhere
to the new puppet_config interface.

Change-Id: If5b73ec90637e878af55c8404d1eff8c18e857c3

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