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

Change-Id: I17d72338d4202117d08b3dca9463be35a87a0c1e
diff --git a/utils/misc/src/test/java/org/onlab/packet/LLDPTest.java b/utils/misc/src/test/java/org/onlab/packet/LLDPTest.java
index 95b0b04..154dee7 100644
--- a/utils/misc/src/test/java/org/onlab/packet/LLDPTest.java
+++ b/utils/misc/src/test/java/org/onlab/packet/LLDPTest.java
@@ -89,6 +89,9 @@
         PacketTestUtils.testDeserializeTruncated(deserializer, bytes);
     }
 
+    /**
+     * Tests deserialize and getters.
+     */
     @Test
     public void testDeserialize() throws Exception {
         LLDP lldp = deserializer.deserialize(bytes, 0, bytes.length);
@@ -112,4 +115,15 @@
         assertEquals(optionalTlvSize, optionalTlv.getLength());
         assertTrue(Arrays.equals(optionalTlvValue, optionalTlv.getValue()));
     }
+
+    /**
+     * Tests toString.
+     */
+    @Test
+    public void testToStringLLDP() throws Exception {
+        LLDP lldp = deserializer.deserialize(bytes, 0, bytes.length);
+        String str = lldp.toString();
+
+        // TODO: need to add LLDP toString unit test
+    }
 }