model+helper+examples: Enable configurability of NFD parameters using StackHelper

Refs: #2353, #2220
diff --git a/examples/ndn-congestion-alt-topo-plugin.cpp b/examples/ndn-congestion-alt-topo-plugin.cpp
index f79bf5d..db0afc7 100644
--- a/examples/ndn-congestion-alt-topo-plugin.cpp
+++ b/examples/ndn-congestion-alt-topo-plugin.cpp
@@ -69,9 +69,8 @@
 
   // Install NDN stack on all nodes
   ndn::StackHelper ndnHelper;
-  ndnHelper.SetContentStoreChoice(false);
-  ndnHelper.SetContentStore("ns3::ndn::cs::Lru", "MaxSize",
-                            "1"); // ! Attention ! If set to 0, then MaxSize is infinite
+  ndnHelper.SetOldContentStore("ns3::ndn::cs::Lru", "MaxSize",
+                               "1"); // ! Attention ! If set to 0, then MaxSize is infinite
   ndnHelper.InstallAll();
 
   // Set BestRoute strategy
diff --git a/examples/ndn-congestion-topo-plugin.cpp b/examples/ndn-congestion-topo-plugin.cpp
index 11fed0e..ba40c7a 100644
--- a/examples/ndn-congestion-topo-plugin.cpp
+++ b/examples/ndn-congestion-topo-plugin.cpp
@@ -57,8 +57,7 @@
 
   // Install NDN stack on all nodes
   ndn::StackHelper ndnHelper;
-  ndnHelper.SetContentStoreChoice(false);
-  ndnHelper.SetContentStore("ns3::ndn::cs::Lru", "MaxSize", "10000");
+  ndnHelper.SetOldContentStore("ns3::ndn::cs::Lru", "MaxSize", "10000");
   ndnHelper.InstallAll();
 
   // Choosing forwarding strategy
diff --git a/examples/ndn-simple-wifi.cpp b/examples/ndn-simple-wifi.cpp
index 8230e18..0afaa14 100644
--- a/examples/ndn-simple-wifi.cpp
+++ b/examples/ndn-simple-wifi.cpp
@@ -105,8 +105,7 @@
   ndn::StackHelper ndnHelper;
   // ndnHelper.AddNetDeviceFaceCreateCallback (WifiNetDevice::GetTypeId (), MakeCallback
   // (MyNetDeviceFaceCallback));
-  ndnHelper.SetContentStoreChoice(false);
-  ndnHelper.SetContentStore("ns3::ndn::cs::Lru", "MaxSize", "1000");
+  ndnHelper.SetOldContentStore("ns3::ndn::cs::Lru", "MaxSize", "1000");
   ndnHelper.SetDefaultRoutes(true);
   ndnHelper.Install(nodes);
 
diff --git a/examples/ndn-tree-cs-tracers.cpp b/examples/ndn-tree-cs-tracers.cpp
index a2059b2..cee7302 100644
--- a/examples/ndn-tree-cs-tracers.cpp
+++ b/examples/ndn-tree-cs-tracers.cpp
@@ -67,11 +67,10 @@
   topologyReader.SetFileName("src/ndnSIM/examples/topologies/topo-tree.txt");
   topologyReader.Read();
 
-  // Install CCNx stack on all nodes
+  // Install NDN stack on all nodes
   ndn::StackHelper ndnHelper;
-  ndnHelper.SetContentStoreChoice(false);
-  ndnHelper.SetContentStore("ns3::ndn::cs::Lru", "MaxSize",
-                            "100"); // default ContentStore parameters
+  ndnHelper.SetOldContentStore("ns3::ndn::cs::Lru", "MaxSize",
+                               "100"); // default ContentStore parameters
   ndnHelper.InstallAll();
 
   // Choosing forwarding strategy
diff --git a/examples/ndn-tree-with-l2tracer.cpp b/examples/ndn-tree-with-l2tracer.cpp
index 52b8e8d..ab80675 100644
--- a/examples/ndn-tree-with-l2tracer.cpp
+++ b/examples/ndn-tree-with-l2tracer.cpp
@@ -38,8 +38,7 @@
   /****************************************************************************/
   // Install NDN stack on all nodes
   ndn::StackHelper ndnHelper;
-  ndnHelper.SetContentStoreChoice(false);
-  ndnHelper.SetContentStore("ns3::ndn::cs::Lru", "MaxSize", "1000");
+  ndnHelper.SetOldContentStore("ns3::ndn::cs::Lru", "MaxSize", "1000");
   ndnHelper.InstallAll();
   /****************************************************************************/
   // Installing global routing interface on all nodes