Configure Neutron to use internalURL for contacting Nova

The Kolla design is for services to use the internalURL for
service to service communication.  In Mitaka, Neutron added
a new config parameter specifying which URL to use to to
contact Nova, making the default 'public'.  This patch sets
the value to 'internal'.

Change-Id: I2d36f3b4a860af9e9034ebfb2b5cea56450e5e4e
Closes-Bug: #1565624

ansible/roles/neutron/templates/neutron.conf.j2

@@ -43,6 +43,7 @@ region_name = {{ openstack_region_name }}
 project_name = service
 username = {{ nova_keystone_user }}
 password = {{ nova_keystone_password }}
+endpoint_type = internal
 
 [oslo_concurrency]
 lock_path = /var/lib/neutron/tmp