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-factory.hpp b/daemon/face/tcp-channel-factory.hpp
index 1baeb58..5027d41 100644
--- a/daemon/face/tcp-channel-factory.hpp
+++ b/daemon/face/tcp-channel-factory.hpp
@@ -10,7 +10,7 @@
 #include "channel-factory.hpp"
 #include "tcp-channel.hpp"
 
-namespace ndn {
+namespace nfd {
 
 class TcpChannelFactory : public ChannelFactory<tcp::Endpoint, TcpChannel>
 {
@@ -73,6 +73,6 @@
   boost::asio::io_service& m_ioService;
 };
 
-} // namespace ndn
+} // namespace nfd
 
 #endif // NFD_FACE_TCP_CHANNEL_FACTORY_HPP