VOL-535 : Use OLT uplink port for packet-in/packet-out towards DHCP server

It is configurable to use this approach or to use an OVS/switch for the same

Change-Id: Iafbdcf3d70eea029c7949622a7048639c333a4d9
diff --git a/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java b/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java
index 66c9b4e..ebde675 100755
--- a/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java
+++ b/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java
@@ -367,6 +367,11 @@
         public Set<ConnectPoint> getDhcpServerConnectPoint() {
             return ImmutableSet.of(SERVER_CONNECT_POINT);
         }
+
+        @Override
+        public boolean getModifySrcDstMacAddresses() {
+            return true;
+        }
     }
 
     /**