Initial DT workflow

Sample PPPoE-based workflow.
Track the subscriber PPPoE protocols state, authentication and IP address assignement are done via PPPoE protocols (PAP, CHAP, IPCP...).
Work with BNG app running on ONOS that generates events in the bng.pppoe Kafka topic.

Change-Id: Iae57395dcc90d027932c790c1c36d7b3e3f3e19b
diff --git a/samples/whitelist.yaml b/samples/whitelist.yaml
new file mode 100755
index 0000000..f4ff477
--- /dev/null
+++ b/samples/whitelist.yaml
@@ -0,0 +1,40 @@
+# Copyright 2020-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# curl -H "xos-username: admin@opencord.org" -H "xos-password: letmein" -X POST --data-binary @oss-service.yaml http://192.168.99.100:30007/run
+
+tosca_definitions_version: tosca_simple_yaml_1_0
+imports:
+  - custom_types/dtworkflowdriverwhitelistentry.yaml
+  - custom_types/dtworkflowdriverservice.yaml
+description: Create an entry in the whitelist
+topology_template:
+  node_templates:
+
+    service#dtworkflow:
+      type: tosca.nodes.DtWorkflowDriverService
+      properties:
+        name: dt-workflow-driver
+        must-exist: true
+
+    whitelist:
+      type: tosca.nodes.DtWorkflowDriverWhiteListEntry
+      properties:
+        serial_number: BRCM22222222
+        pon_port_id: 536870912
+        device_id: of:000000000a5a0072
+      requirements:
+        - owner:
+            node: service#dtworkflow
+            relationship: tosca.relationships.BelongsToOne