Add 'service_name' to composable services

This patch adds a new service_name section to each composable
service. We now have an explicit unit test check to ensure that
service_name exists in tools/yaml-validate.py.

This patch also wires service_names into hieradata on each
of the roles so that tools can access the deployed services locally
during deployment and upgrades.

Change-Id: I60861c5aa760534db3e314bba16a13b90ea72f0c

puppet/services/neutron-plugin-plumgrid.yaml

@@ -80,6 +80,7 @@ outputs:
   role_data:
     description: Role data for the Neutron Plumgrid plugin
     value:
+      service_name: neutron-plugin-plumgrid
       config_settings:
         neutron::plugins::plumgrid::connection:
           list_join: