Change namespace of DummyClientFace, Signal, Segmenter, SegmentFetcher

refs #3940

Change-Id: Ia3c9b4adcca9ff79a14be705ca9da525914f3dff
diff --git a/tools/nlsrc.cpp b/tools/nlsrc.cpp
index 16807a7..4b16aaa 100644
--- a/tools/nlsrc.cpp
+++ b/tools/nlsrc.cpp
@@ -334,7 +334,7 @@
   name.append(datasetType);
   ndn::Interest interest(name);
 
-  auto fetcher = ndn::util::SegmentFetcher::start(m_face, interest, *m_validator);
+  auto fetcher = ndn::SegmentFetcher::start(m_face, interest, *m_validator);
   fetcher->onComplete.connect(std::bind(&Nlsrc::onFetchSuccess<T>, this, _1, recordLsa));
   fetcher->onError.connect(std::bind(&Nlsrc::onTimeout, this, _1, _2));
 }
@@ -363,7 +363,7 @@
   name.append(RT_SUFFIX);
   ndn::Interest interest(name);
 
-  auto fetcher = ndn::util::SegmentFetcher::start(m_face, interest, *m_validator);
+  auto fetcher = ndn::SegmentFetcher::start(m_face, interest, *m_validator);
   fetcher->onComplete.connect(std::bind(&Nlsrc::onFetchSuccess<T>, this, _1, recordDataset));
   fetcher->onError.connect(std::bind(&Nlsrc::onTimeout, this, _1, _2));
 }