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

Change-Id: I17d72338d4202117d08b3dca9463be35a87a0c1e
diff --git a/utils/misc/src/test/java/org/onlab/packet/PacketTestUtils.java b/utils/misc/src/test/java/org/onlab/packet/PacketTestUtils.java
index 209b1d2..3fcd6b5 100644
--- a/utils/misc/src/test/java/org/onlab/packet/PacketTestUtils.java
+++ b/utils/misc/src/test/java/org/onlab/packet/PacketTestUtils.java
@@ -61,7 +61,7 @@
      * deserialize the packet.
      *
      * @param deserializer deserializer function to test
-     * @param header byte array of a full-size packet
+     * @param header       byte array of a full-size packet
      */
     public static void testDeserializeTruncated(Deserializer deserializer,
                                                 byte[] header) {
@@ -82,9 +82,9 @@
      * DeserializationException is not thrown by the deserializer function.
      *
      * @param deserializer deserializer function to test
-     * @param bytes input byte array
-     * @param offset input offset
-     * @param length input length
+     * @param bytes        input byte array
+     * @param offset       input offset
+     * @param length       input length
      */
     public static void expectDeserializationException(Deserializer deserializer,
                                                       byte[] bytes, int offset, int length) {