fw: rename RetransmissionSuppression to RetxSuppressionFixed

This commit also declares RetxSuppression base class as the API
for any retransmission suppression decision algorithms,
so that other algorithms can be introduced.

refs #1913

Change-Id: I5539565d2dd238d1421f5bd828fde4ecfba0a820
diff --git a/daemon/fw/access-strategy.hpp b/daemon/fw/access-strategy.hpp
index 7410b51..5fadc85 100644
--- a/daemon/fw/access-strategy.hpp
+++ b/daemon/fw/access-strategy.hpp
@@ -28,7 +28,7 @@
 
 #include "strategy.hpp"
 #include "rtt-estimator.hpp"
-#include "retransmission-suppression.hpp"
+#include "retx-suppression-fixed.hpp"
 #include <unordered_set>
 #include <unordered_map>
 
@@ -167,7 +167,7 @@
 
 private:
   FaceInfoTable m_fit;
-  RetransmissionSuppression m_retransmissionSuppression;
+  RetxSuppressionFixed m_retxSuppression;
   signal::ScopedConnection m_removeFaceInfoConn;
 };