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.cpp b/daemon/fw/access-strategy.cpp
index ece5a83..e726d27 100644
--- a/daemon/fw/access-strategy.cpp
+++ b/daemon/fw/access-strategy.cpp
@@ -50,16 +50,15 @@
                                      shared_ptr<fib::Entry> fibEntry,
                                      shared_ptr<pit::Entry> pitEntry)
 {
-  RetransmissionSuppression::Result suppressResult =
-      m_retransmissionSuppression.decide(inFace, interest, *pitEntry);
+  RetxSuppression::Result suppressResult = m_retxSuppression.decide(inFace, interest, *pitEntry);
   switch (suppressResult) {
-  case RetransmissionSuppression::NEW:
+  case RetxSuppression::NEW:
     this->afterReceiveNewInterest(inFace, interest, fibEntry, pitEntry);
     break;
-  case RetransmissionSuppression::FORWARD:
+  case RetxSuppression::FORWARD:
     this->afterReceiveRetxInterest(inFace, interest, fibEntry, pitEntry);
     break;
-  case RetransmissionSuppression::SUPPRESS:
+  case RetxSuppression::SUPPRESS:
     NFD_LOG_DEBUG(interest << " interestFrom " << inFace.getId() << " retx-suppress");
     break;
   default: