Fix exception "class not registered for kryo" for setQueue instruction

The exception

    Class is not registered: org.onosproject.net.flow.instructions.Instructions$SetQueueInstruction

occurs, because this class was not registered for kryo.

See also
https://groups.google.com/a/onosproject.org/forum/#!topic/onos-discuss/hVJxK7YhWA4

Change-Id: I73d6d0ba59c0fafa0990264cc3e4a3c0b1f5eb56

@@ -389,6 +389,7 @@ public final class KryoNamespaces {
                     Instructions.NoActionInstruction.class,
                     Instructions.NoActionInstruction.class,
                     Instructions.OutputInstruction.class,
                     Instructions.OutputInstruction.class,
                     Instructions.GroupInstruction.class,
                     Instructions.GroupInstruction.class,
+                    Instructions.SetQueueInstruction.class,
                     Instructions.TableTypeTransition.class,
                     Instructions.TableTypeTransition.class,
                     L0ModificationInstruction.class,
                     L0ModificationInstruction.class,
                     L0ModificationInstruction.L0SubType.class,
                     L0ModificationInstruction.L0SubType.class,