fw: abstract retransmission suppression logic

Consumer retransmission suppression logic of best-route v2 strategy
is abstracted into RetransmissionSuppression class, so that it can
be reused in other strategies.

refs #2377

Change-Id: I7de2c2d0e60c5ad3467e24283e9b03bd03f65bdc
diff --git a/daemon/fw/best-route-strategy2.hpp b/daemon/fw/best-route-strategy2.hpp
index bb259d0..5a0f3be 100644
--- a/daemon/fw/best-route-strategy2.hpp
+++ b/daemon/fw/best-route-strategy2.hpp
@@ -1,12 +1,12 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014,  Regents of the University of California,
- *                      Arizona Board of Regents,
- *                      Colorado State University,
- *                      University Pierre & Marie Curie, Sorbonne University,
- *                      Washington University in St. Louis,
- *                      Beijing Institute of Technology,
- *                      The University of Memphis
+ * Copyright (c) 2014-2015,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
  *
  * This file is part of NFD (Named Data Networking Forwarding Daemon).
  * See AUTHORS.md for complete list of NFD authors and contributors.
@@ -27,6 +27,7 @@
 #define NFD_DAEMON_FW_BEST_ROUTE_STRATEGY2_HPP
 
 #include "strategy.hpp"
+#include "retransmission-suppression.hpp"
 
 namespace nfd {
 namespace fw {
@@ -52,7 +53,9 @@
 
 public:
   static const Name STRATEGY_NAME;
-  static const time::milliseconds MIN_RETRANSMISSION_INTERVAL;
+
+private:
+  RetransmissionSuppression m_retransmissionSuppression;
 };
 
 } // namespace fw