Remove duplicated multicast prefix declaration

(Following #7957)
Also,
Update copyright
Few documentation improvements

Change-Id: If4a6b9f168e9d7587976f1f2b59c2b59b81c6c2f
diff --git a/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java b/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java
index 8505d10..43a9d5e 100644
--- a/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java
+++ b/utils/misc/src/test/java/org/onlab/packet/IpAddressTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2015 Open Networking Laboratory
+ * Copyright 2014-2016 Open Networking Laboratory
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.