CORD-3118 Mount node key in ONOS container for VTN (optional)

Change-Id: I61fd1f94c59db0992e640167e4cc28325f7d8be0
diff --git a/onos/templates/deployment.yaml b/onos/templates/deployment.yaml
index 585b250..9915686 100644
--- a/onos/templates/deployment.yaml
+++ b/onos/templates/deployment.yaml
@@ -57,6 +57,16 @@
               containerPort: {{ .Values.services.cluster.port }}
           resources:
 {{ toYaml .Values.resources | indent 12 }}
+          volumeMounts:
+            - name: node-key
+              mountPath: /root/vtn
+              readOnly: true
+      volumes:
+        - name: node-key
+          secret:
+            secretName: node-key
+            defaultMode: 256
+            optional: true
     {{- with .Values.nodeSelector }}
       nodeSelector:
 {{ toYaml . | indent 8 }}