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/daemon/table/pit.cpp b/daemon/table/pit.cpp
index 9c2554a..6f0e446 100644
--- a/daemon/table/pit.cpp
+++ b/daemon/table/pit.cpp
@@ -82,7 +82,7 @@
   // then check if this Interest is already in the PIT entries
   std::vector<shared_ptr<pit::Entry> >::const_iterator it =
     std::find_if(pitEntries.begin(), pitEntries.end(),
-                 bind(&predicate_PitEntry_similar_Interest, _1, boost::cref(interest)));
+                 bind(&predicate_PitEntry_similar_Interest, _1, cref(interest)));
 
   if (it != pitEntries.end())
     {
diff --git a/daemon/table/strategy-choice.cpp b/daemon/table/strategy-choice.cpp
index fff84c1..2383118 100644
--- a/daemon/table/strategy-choice.cpp
+++ b/daemon/table/strategy-choice.cpp
@@ -265,7 +265,7 @@
 
   std::for_each(m_nameTree.partialEnumerate(entry->getPrefix(),
                            bind(&predicate_nameTreeEntry_needResetStrategyChoice,
-                                _1, boost::cref(*m_nameTree.get(*entry)))),
+                                _1, cref(*m_nameTree.get(*entry)))),
                 m_nameTree.end(),
                 &clearStrategyInfo);
 }
diff --git a/daemon/table/strategy-info-host.hpp b/daemon/table/strategy-info-host.hpp
index dfe9341..361eaaf 100644
--- a/daemon/table/strategy-info-host.hpp
+++ b/daemon/table/strategy-info-host.hpp
@@ -91,7 +91,7 @@
 {
   shared_ptr<T> info = this->getStrategyInfo<T>();
   if (!static_cast<bool>(info)) {
-    info = make_shared<T>(boost::ref(a1));
+    info = make_shared<T>(ref(a1));
     this->setStrategyInfo(info);
   }
   return info;