Bug fix for specifying vlan-tagged interface for bng-intf

Change-Id: I881973f1630a88e3d76ff61945741fb2269f2209
diff --git a/tosca-configs/voltha/onf-demo-pod-onos-netcfg-switch-inband.json b/tosca-configs/voltha/onf-demo-pod-onos-netcfg-switch-inband.json
index 0ec3999..66e893b 100644
--- a/tosca-configs/voltha/onf-demo-pod-onos-netcfg-switch-inband.json
+++ b/tosca-configs/voltha/onf-demo-pod-onos-netcfg-switch-inband.json
@@ -22,7 +22,7 @@
     },
     "of:0000000000000001/31" : {
       "interfaces" : [
-        { "name" : "bng-intf", "vlan-tagged": 4093 }
+        { "name" : "bng-intf", "vlan-tagged": [4093] }
       ]
     },
     "of:0000000000000001/1" : {