all: avoid usage of deprecated namespace ndn::Tlv

refs #2079

Change-Id: I3d8748929706726b55fe1a9a0f6ae00857ea3547
diff --git a/tests/rib/rib-status-publisher-common.hpp b/tests/rib/rib-status-publisher-common.hpp
index 11728a0..58ccd68 100644
--- a/tests/rib/rib-status-publisher-common.hpp
+++ b/tests/rib/rib-status-publisher-common.hpp
@@ -70,7 +70,7 @@
 
     buffer.appendByteArray(payload.value(), payload.value_size());
     buffer.prependVarNumber(buffer.size());
-    buffer.prependVarNumber(ndn::Tlv::Content);
+    buffer.prependVarNumber(tlv::Content);
 
     ndn::Block parser(buffer.buf(), buffer.size());
     parser.parse();