model+helper: Adding new variable (realDelay) which is currently set by the global routing controller.

This variable can be used to analyze behavior of RTT estimation or some
other analysis tasks.
diff --git a/helper/ndn-global-routing-helper.cc b/helper/ndn-global-routing-helper.cc
index cda977a..1eb9d1f 100644
--- a/helper/ndn-global-routing-helper.cc
+++ b/helper/ndn-global-routing-helper.cc
@@ -283,6 +283,8 @@
                                     << " with delay " << i->second.get<2> ());
                     
                       Ptr<fib::Entry> entry = fib->Add (prefix, i->second.get<0> (), i->second.get<1> ());
+                      entry->SetRealDelayToProducer (i->second.get<0> (), Seconds (i->second.get<2> ()));
+                        
                       Ptr<Limits> faceLimits = i->second.get<0> ()->GetObject<Limits> ();
 
                       Ptr<Limits> fibLimits = entry->GetObject<Limits> ();