Change namespace of DummyClientFace, Signal, Segmenter, SegmentFetcher

refs #3940

Change-Id: Ia3c9b4adcca9ff79a14be705ca9da525914f3dff
diff --git a/tests/route/test-routing-table.cpp b/tests/route/test-routing-table.cpp
index 1e689a7..b777a04 100644
--- a/tests/route/test-routing-table.cpp
+++ b/tests/route/test-routing-table.cpp
@@ -35,7 +35,7 @@
   ndn::Scheduler m_scheduler{m_io};
 
 public:
-  ndn::util::DummyClientFace face{m_io, m_keyChain, {true, true}};
+  ndn::DummyClientFace face{m_io, m_keyChain, {true, true}};
   ConfParameter conf{face, m_keyChain};
   DummyConfFileProcessor confProcessor{conf};