fw: add strategy notification for Interests dropped by LpReliability

add dropped Interest counter to faces

refs #3823

Change-Id: I9910b66932d74383203e8f3732bb45cade83b972
diff --git a/daemon/fw/strategy.hpp b/daemon/fw/strategy.hpp
index 99ed1dc..e09b590 100644
--- a/daemon/fw/strategy.hpp
+++ b/daemon/fw/strategy.hpp
@@ -1,5 +1,5 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
+/*
  * Copyright (c) 2014-2017,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
@@ -181,6 +181,13 @@
   afterReceiveNack(const Face& inFace, const lp::Nack& nack,
                    const shared_ptr<pit::Entry>& pitEntry);
 
+  /** \brief trigger after Interest dropped for exceeding allowed retransmissions
+   *
+   *  In the base class this method does nothing.
+   */
+  virtual void
+  onDroppedInterest(const Face& outFace, const Interest& interest);
+
 protected: // actions
   /** \brief send Interest to outFace
    *  \param pitEntry PIT entry