Fixed Findbugs issues in forwarding and arp modules

Change-Id: I25582ed3ea49848d77f88229303a964c510e578b
diff --git a/src/main/java/net/onrc/onos/apps/proxyarp/PacketOutNotification.java b/src/main/java/net/onrc/onos/apps/proxyarp/PacketOutNotification.java
index c0b56a7..a3cbb28 100644
--- a/src/main/java/net/onrc/onos/apps/proxyarp/PacketOutNotification.java
+++ b/src/main/java/net/onrc/onos/apps/proxyarp/PacketOutNotification.java
@@ -1,6 +1,7 @@
 package net.onrc.onos.apps.proxyarp;
 
 import java.io.Serializable;
+import java.util.Arrays;
 
 /**
  * A PacketOutNotification contains data sent between ONOS instances that
@@ -24,6 +25,6 @@
     }
 
     public PacketOutNotification(byte[] packet) {
-        this.packet = packet;
+        this.packet = Arrays.copyOf(packet, packet.length);
     }
 }