nlsr: removed references to ndn-cxx/common aliases and improved namespacing

Change-Id: I65e4691305b0157f334fc68d96998c119ef8b03b
refs: #3406
diff --git a/tests/test-lsdb.cpp b/tests/test-lsdb.cpp
index 2dd6f3e..49501bf 100644
--- a/tests/test-lsdb.cpp
+++ b/tests/test-lsdb.cpp
@@ -123,8 +123,8 @@
   BOOST_CHECK_EQUAL(it->getName(), oldInterestName);
   interests.clear();
 
-  steady_clock::TimePoint deadline = steady_clock::now() +
-                                     ndn::time::seconds(LSA_REFRESH_TIME_MAX);
+  ndn::time::steady_clock::TimePoint deadline = ndn::time::steady_clock::now() +
+    ndn::time::seconds(LSA_REFRESH_TIME_MAX);
 
   // Simulate an LSA interest timeout
   lsdb.onFetchLsaError(ndn::util::SegmentFetcher::ErrorCode::INTEREST_TIMEOUT, "Timeout",