face: Transport::canChangePersistencyTo

Feasibility of transport persistency change can be checked with
Transport::canChangePersistencyTo before executing the actual change.
This enables management to verify persistency and other parameters
in a faces/update command before applying the updates.

Change-Id: Ia283f0daf678f47aad7b78b7e06dee4827f57cab
refs: #3232
diff --git a/daemon/face/internal-transport.cpp b/daemon/face/internal-transport.cpp
index cc3e0a6..5b82c20 100644
--- a/daemon/face/internal-transport.cpp
+++ b/daemon/face/internal-transport.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014-2015,  Regents of the University of California,
+ * Copyright (c) 2014-2017,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -46,15 +46,6 @@
 }
 
 void
-InternalForwarderTransport::beforeChangePersistency(ndn::nfd::FacePersistency newPersistency)
-{
-  if (newPersistency != ndn::nfd::FACE_PERSISTENCY_PERMANENT) {
-    BOOST_THROW_EXCEPTION(
-      std::invalid_argument("InternalForwarderTransport supports only FACE_PERSISTENCY_PERMANENT"));
-  }
-}
-
-void
 InternalForwarderTransport::receiveFromLink(const Block& packet)
 {
   NFD_LOG_FACE_TRACE(__func__);