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/mgmt/strategy-choice-manager.cpp b/tests/daemon/mgmt/strategy-choice-manager.cpp
index 99d5636..9b5f2c5 100644
--- a/tests/daemon/mgmt/strategy-choice-manager.cpp
+++ b/tests/daemon/mgmt/strategy-choice-manager.cpp
@@ -50,7 +50,8 @@
     , m_manager(m_strategyChoice, m_face)
     , m_callbackFired(false)
   {
-    m_strategyChoice.install(make_shared<DummyStrategy>(boost::ref(m_forwarder), "/localhost/nfd/strategy/test-strategy-a"));
+    m_strategyChoice.install(make_shared<DummyStrategy>(ref(m_forwarder),
+                                                        "/localhost/nfd/strategy/test-strategy-a"));
     m_strategyChoice.insert("ndn:/", "/localhost/nfd/strategy/test-strategy-a");
   }
 
@@ -169,7 +170,8 @@
 public:
   AllStrategiesFixture()
   {
-    m_strategyChoice.install(make_shared<DummyStrategy>(boost::ref(m_forwarder), "/localhost/nfd/strategy/test-strategy-b"));
+    m_strategyChoice.install(make_shared<DummyStrategy>(ref(m_forwarder),
+                                                        "/localhost/nfd/strategy/test-strategy-b"));
   }
 
   virtual