src: Changing namespace ndn to namespace nfd

Also, this commit imports used classes from ::ndn namespace (from
NDN-CPP library) directly to ::nfd namespace.

refs: #1163

Change-Id: I9cc9d72e00af495b4ed0c84e6d418a7c9ba986cb
diff --git a/daemon/face/tcp-channel.hpp b/daemon/face/tcp-channel.hpp
index 8536203..bd0388a 100644
--- a/daemon/face/tcp-channel.hpp
+++ b/daemon/face/tcp-channel.hpp
@@ -15,7 +15,7 @@
 typedef boost::asio::ip::tcp::endpoint Endpoint;
 } // namespace tcp
 
-namespace ndn {
+namespace nfd {
 
 /**
  * \brief Class implementing TCP-based channel to create faces
@@ -125,6 +125,6 @@
   shared_ptr<boost::asio::ip::tcp::acceptor> m_acceptor;
 };
 
-} // namespace ndn
+} // namespace nfd
  
 #endif // NFD_FACE_TCP_CHANNEL_HPP