Allow keystone endpoint_type interpolation for Neutron models
 - Add 'endpoint_type' identity parameter
 - Set 'endpoint_type: internal' as a
   default parameter for 'service' reclass model (/metadata/)

Change-Id: If328588f2a6f324aec1df7b4ba7ba03ce9431855
diff --git a/metadata/service/control/single.yml b/metadata/service/control/single.yml
index ea2c0f7..3be2831 100644
--- a/metadata/service/control/single.yml
+++ b/metadata/service/control/single.yml
@@ -3,6 +3,8 @@
 classes:
 - service.neutron.support
 parameters:
+  _param:
+    keystone_neutron_endpoint_type: internal
   neutron:
     server:
       enabled: true
@@ -29,6 +31,7 @@
         user: neutron
         password: ${_param:keystone_neutron_password}
         tenant: service
+        endpoint_type: ${_param:keystone_neutron_endpoint_type}
       message_queue:
         engine: rabbitmq
         host: ${_param:single_address}