Allow vlan tagging for Dbuf VF interface

Change-Id: I672981bf397936be0aa8cfb7cc52c902ae3cc1e8
diff --git a/apps/dbuf/templates/networks.yaml b/apps/dbuf/templates/networks.yaml
index 07eb55b..84e0cf5 100644
--- a/apps/dbuf/templates/networks.yaml
+++ b/apps/dbuf/templates/networks.yaml
@@ -14,6 +14,9 @@
   config: '{
   "type": "sriov",
   "name": "sriov-network",
+{{- if hasKey .Values.network "vlan" }}
+  "vlan": {{ .Values.network.vlan }},
+{{- end }}
   "ipam": {
     {{- if eq .Values.network.ipam "host-local" }}
     "type": "host-local",
@@ -27,4 +30,4 @@
 
     {{- end }}
   }
-}'
\ No newline at end of file
+}'