Fix SONA to support vlan network mode.

Change-Id: Ib280ae4a41be1bfb86f1efc34011651a7390437b
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingSnatHandler.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingSnatHandler.java
index b109d2c..4657c18 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingSnatHandler.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/OpenstackRoutingSnatHandler.java
@@ -337,8 +337,7 @@
                 break;
             case VLAN:
                 tBuilder.pushVlan()
-                        .setVlanId(VlanId.vlanId(segmentId))
-                        .setEthSrc(DEFAULT_GATEWAY_MAC);
+                        .setVlanId(VlanId.vlanId(segmentId));
                 break;
             default:
                 final String error = String.format("%s %s",