Designate/Neutron communicaton failure

Designate communicate on publicURL (Default) endpoint with Neutron.
When TLS is enabled it generates errors (Missing certificate). We
need to ensure designate communicate with neutron on internalURL.

Change-Id: Ie969fc2d1a2d4241371b459af2fc5b7bdf236bf0
Closes-Bug: #1742625

ansible/roles/designate/templates/designate.conf.j2

@@ -60,6 +60,9 @@ cache_driver = sqlalchemy
 pool_id = {{ designate_pool_id }}
 workers = {{ openstack_service_workers }}
 
+[network_api:neutron]
+endpoint_type = internalURL
+
 [pool_manager_cache:sqlalchemy]
 connection = mysql+pymysql://{{ designate_pool_manager_database_user }}:{{ designate_pool_manager_database_password }}@{{ designate_pool_manager_database_address }}/{{ designate_pool_manager_database_name }}
 max_retries = 10