fw: add strategy parameters to configure exponential retx suppression

Supported by ASF, BestRoute, and Multicast strategies

Refs: #4924
Change-Id: I215d9212d90b93fa622cc65278703dc5198d0c9d
diff --git a/daemon/fw/multicast-strategy.hpp b/daemon/fw/multicast-strategy.hpp
index fe122a4..6ff301d 100644
--- a/daemon/fw/multicast-strategy.hpp
+++ b/daemon/fw/multicast-strategy.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2021,  Regents of the University of California,
+ * Copyright (c) 2014-2022,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -51,12 +51,8 @@
   void
   afterNewNextHop(const fib::NextHop& nextHop, const shared_ptr<pit::Entry>& pitEntry) override;
 
-private:
-  RetxSuppressionExponential m_retxSuppression;
-
 NFD_PUBLIC_WITH_TESTS_ELSE_PRIVATE:
-  static const time::milliseconds RETX_SUPPRESSION_INITIAL;
-  static const time::milliseconds RETX_SUPPRESSION_MAX;
+  std::unique_ptr<RetxSuppressionExponential> m_retxSuppression;
 };
 
 } // namespace fw