Add copyright and comments to test model file

Author: rakillen

core/src/test/resources/prepare/wko-filter.yaml

@@ -1,3 +1,9 @@
+# Copyright (c) 2021, Oracle and/or its affiliates.
+# Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl.
+
+# This model is altered by wko_filter to be suitable for deployment with WebLogic Kubernetes Operator.
+# see wko_filter_test.py
+
 domainInfo:
     AdminUserName: weblogic
     AdminPassword: 'welcome1'