face, mgmt: add channel status dataset publisher

Expose channel maps in protocol factories

Change-Id: I057b1bba638bfc9372867318653d71ba7d0e9888
Refs: #1631, #1653
diff --git a/daemon/face/unix-stream-factory.cpp b/daemon/face/unix-stream-factory.cpp
index 45668c9..d7513f6 100644
--- a/daemon/face/unix-stream-factory.cpp
+++ b/daemon/face/unix-stream-factory.cpp
@@ -1,11 +1,12 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014  Regents of the University of California,
- *                     Arizona Board of Regents,
- *                     Colorado State University,
- *                     University Pierre & Marie Curie, Sorbonne University,
- *                     Washington University in St. Louis,
- *                     Beijing Institute of Technology
+ * Copyright (c) 2014,  Regents of the University of California,
+ *                      Arizona Board of Regents,
+ *                      Colorado State University,
+ *                      University Pierre & Marie Curie, Sorbonne University,
+ *                      Washington University in St. Louis,
+ *                      Beijing Institute of Technology,
+ *                      The University of Memphis
  *
  * This file is part of NFD (Named Data Networking Forwarding Daemon).
  * See AUTHORS.md for complete list of NFD authors and contributors.
@@ -20,7 +21,7 @@
  *
  * You should have received a copy of the GNU General Public License along with
  * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
- **/
+ */
 
 #include "unix-stream-factory.hpp"
 
@@ -62,4 +63,16 @@
   throw Error("UnixStreamFactory does not support 'createFace' operation");
 }
 
+std::list<shared_ptr<const Channel> >
+UnixStreamFactory::getChannels() const
+{
+  std::list<shared_ptr<const Channel> > channels;
+  for (ChannelMap::const_iterator i = m_channels.begin(); i != m_channels.end(); ++i)
+    {
+      channels.push_back(i->second);
+    }
+
+  return channels;
+}
+
 } // namespace nfd