[ONOS-3222] Implement toString method for each Packet class

Change-Id: I17d72338d4202117d08b3dca9463be35a87a0c1e
diff --git a/utils/misc/src/test/java/org/onlab/packet/ndp/RedirectTest.java b/utils/misc/src/test/java/org/onlab/packet/ndp/RedirectTest.java
index 3115714..e70da7c 100644
--- a/utils/misc/src/test/java/org/onlab/packet/ndp/RedirectTest.java
+++ b/utils/misc/src/test/java/org/onlab/packet/ndp/RedirectTest.java
@@ -144,4 +144,15 @@
         assertTrue(rd1.equals(rd1));
         assertFalse(rd1.equals(rd2));
     }
+
+    /**
+     * Tests toString.
+     */
+    @Test
+    public void testToStringRedirect() throws Exception {
+        Redirect rd = deserializer.deserialize(bytePacket, 0, bytePacket.length);
+        String str = rd.toString();
+
+        // TODO: need to handle TARGET_ADDRESS and DESTINATION_ADDRESS
+    }
 }