Fix: configure the correct ethernet address of ARP reply for k8s

Change-Id: Ia217ab5250a498ae83b32388d2db56941f0e6f01
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sRoutingSnatHandler.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sRoutingSnatHandler.java
index fccbaaf..f16bdda 100644
--- a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sRoutingSnatHandler.java
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sRoutingSnatHandler.java
@@ -287,8 +287,9 @@
                     .extension(buildMoveEthSrcToDstExtension(device), device.id())
                     .extension(buildMoveArpShaToThaExtension(device), device.id())
                     .extension(buildMoveArpSpaToTpaExtension(device), device.id())
-                    .setArpSpa(Ip4Address.valueOf(k8sNode.extBridgeIp().toString()))
+                    .setEthSrc(k8sNode.extBridgeMac())
                     .setArpSha(k8sNode.extBridgeMac())
+                    .setArpSpa(Ip4Address.valueOf(k8sNode.extBridgeIp().toString()))
                     .setOutput(PortNumber.IN_PORT)
                     .build();