Implemented multi-instance packet out.

We've defined a PacketStore abstraction through which outbound packets are
sent. The packet store has a simple implementation (basically a no-op) and a
distributed implementation on top of the cluster messaging service.

Change-Id: Ib32753314fe518ef1fd67c858db744b004539938
diff --git a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoSerializer.java b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoSerializer.java
index 03c3927..da37848 100644
--- a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoSerializer.java
+++ b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/KryoSerializer.java
@@ -15,9 +15,10 @@
  */
 package org.onlab.onos.store.serializers;
 
-import org.onlab.util.KryoNamespace;
 import java.nio.ByteBuffer;
 
+import org.onlab.util.KryoNamespace;
+
 /**
  * StoreSerializer implementation using Kryo.
  */
@@ -30,7 +31,7 @@
     }
 
     /**
-     * Sets up the common serialzers pool.
+     * Sets up the common serializers pool.
      */
     protected void setupKryoPool() {
         serializerPool = KryoNamespace.newBuilder()