Set docker image tag for OpenContrail in defaults

Change-Id: Ia5eca39b401b6b72c24f904aa84c875a7f5b2629
Related-PROD: PROD-28995
diff --git a/defaults/docker_images.yml b/defaults/docker_images.yml
index edd2197..9a9f309 100644
--- a/defaults/docker_images.yml
+++ b/defaults/docker_images.yml
@@ -22,6 +22,8 @@
     # model-generator
     docker_image_operations_api: "${_param:mcp_docker_registry}/mirantis/model-generator/operations-api:${_param:mcp_version}"
     docker_image_operations_ui: "${_param:mcp_docker_registry}/mirantis/model-generator/operations-ui:${_param:mcp_version}"
+    # OpenContrail
+    opencontrail_docker_image_tag: "${_param:mcp_version}"
     # stacklight
     # 6.5.0 version, from 11/29/2018, differ from latest upstream 6.5.0 - update next cycle
     docker_image_alerta: "${_param:mcp_docker_registry}/mirantis/external/alerta-web:${_param:mcp_version}"