model: Another set of refactoring/renaming to make code compile (not tested yet)

Refs #1005 (http://redmine.named-data.net/)
diff --git a/utils/tracers/ndn-l3-tracer.h b/utils/tracers/ndn-l3-tracer.h
index c264d49..260fe61 100644
--- a/utils/tracers/ndn-l3-tracer.h
+++ b/utils/tracers/ndn-l3-tracer.h
@@ -103,13 +103,13 @@
 
 
   virtual void
-  OutData  (Ptr<const ContentObject>, Ptr<const Packet>, bool fromCache, Ptr<const Face>) = 0;
+  OutData  (Ptr<const ContentObject>, bool fromCache, Ptr<const Face>) = 0;
 
   virtual void
-  InData   (Ptr<const ContentObject>, Ptr<const Packet>, Ptr<const Face>) = 0;
+  InData   (Ptr<const ContentObject>, Ptr<const Face>) = 0;
 
   virtual void
-  DropData (Ptr<const ContentObject>, Ptr<const Packet>, Ptr<const Face>) = 0;
+  DropData (Ptr<const ContentObject>, Ptr<const Face>) = 0;
 
   virtual void
   SatisfiedInterests (Ptr<const pit::Entry>) = 0;