Set docker image tag for OpenContrail in defaults

Change-Id: Ia5eca39b401b6b72c24f904aa84c875a7f5b2629
Related-PROD: PROD-28995
diff --git a/opencontrail/control/control4_0.yml b/opencontrail/control/control4_0.yml
index fb751ca..a9d5f22 100644
--- a/opencontrail/control/control4_0.yml
+++ b/opencontrail/control/control4_0.yml
@@ -7,7 +7,6 @@
   _param:
     opencontrail_version: 4.0
     linux_repo_contrail_component: oc40
-    opencontrail_image_tag: latest
     opencontrail_host_configdb_log_dir: '/var/log/configdb'
     opencontrail_cassandra_log_dir: '/var/log/cassandra'
     opencontrail_zookeeper_log_dir: '/var/log/zookeeper'
@@ -15,7 +14,7 @@
     opencontrail_message_queue_node02_address: ${_param:openstack_message_queue_node02_address}
     opencontrail_message_queue_node03_address: ${_param:openstack_message_queue_node03_address}
     opencontrail_message_queue_password: guest
-    opencontrail_controller_image: ${_param:mcp_docker_registry}/opencontrail-${_param:linux_repo_contrail_component}/opencontrail-controller:${_param:opencontrail_image_tag}
+    opencontrail_controller_image: ${_param:mcp_docker_registry}/opencontrail-${_param:linux_repo_contrail_component}/opencontrail-controller:${_param:opencontrail_docker_image_tag}
     opencontrail_controller_container_name: opencontrail_controller_1
     opencontrail_api_workers_count: 1
     analytics_vip_address: ${_param:opencontrail_analytics_address}