src: Remove unnecessary uses of boost::cref in make_shared and replace boost::cref/boost::ref with just cref/ref

In some cases, due to argument-dependent lookup, it is necessary to use
ndn::ref, instead of just ref.

Change-Id: I682180a007609535855f77511b49622154ad4f11
Refs: #1591
diff --git a/tests/daemon/table/measurements-accessor.cpp b/tests/daemon/table/measurements-accessor.cpp
index 6dc8ff3..cbcbe5a 100644
--- a/tests/daemon/table/measurements-accessor.cpp
+++ b/tests/daemon/table/measurements-accessor.cpp
@@ -68,9 +68,9 @@
   Forwarder forwarder;
 
   shared_ptr<MeasurementsAccessorTestStrategy> strategy1 =
-    make_shared<MeasurementsAccessorTestStrategy>(boost::ref(forwarder), "ndn:/strategy1");
+    make_shared<MeasurementsAccessorTestStrategy>(ref(forwarder), "ndn:/strategy1");
   shared_ptr<MeasurementsAccessorTestStrategy> strategy2 =
-    make_shared<MeasurementsAccessorTestStrategy>(boost::ref(forwarder), "ndn:/strategy2");
+    make_shared<MeasurementsAccessorTestStrategy>(ref(forwarder), "ndn:/strategy2");
 
   Name nameRoot("ndn:/");
   Name nameA   ("ndn:/A");