util: FaceUri: add syntax for NIC-associated permanent faces

refs #3522

Change-Id: Id2c9f751d7d1f65b2f0ef968aad660e95250d155
diff --git a/src/util/face-uri.hpp b/src/util/face-uri.hpp
index f7cbe41..b222323 100644
--- a/src/util/face-uri.hpp
+++ b/src/util/face-uri.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014,  Regents of the University of California,
+ * Copyright (c) 2014-2016,  Regents of the University of California,
  *                      Arizona Board of Regents,
  *                      Colorado State University,
  *                      University Pierre & Marie Curie, Sorbonne University,
@@ -103,6 +103,10 @@
   static FaceUri
   fromDev(const std::string& ifname);
 
+  /// create udp4 or udp6 NIC-associated FaceUri from endpoint and network device name
+  static FaceUri
+  fromUdpDev(const boost::asio::ip::udp::endpoint& endpoint, const std::string& ifname);
+
 public: // getters
   /// get scheme (protocol)
   const std::string&