Moving around path weight tagging. Now CcnxFace owns metric field, which is used for tagging.

Correcting bugs in blackhole-sprint scenario.  This time it should be
the right one:
- instead of a hijacker app, all faces on hijacked node are turned down
- there was a trick with RTT estimation (when batch, it is necessary to
  reset history upon a new batch)
- instead of random runs, trying all possible combinations of
  producer/hijacker
diff --git a/model/ccnx-path-stretch-tag.cc b/model/ccnx-path-stretch-tag.cc
index c8fc6dd..31adca1 100644
--- a/model/ccnx-path-stretch-tag.cc
+++ b/model/ccnx-path-stretch-tag.cc
@@ -105,11 +105,12 @@
       if (info != m_infos.begin ()) os << ",";
       NS_ASSERT (info->node != 0);
 
-      std::string name = Names::FindName (info->node);
-      if (!name.empty ())
-        os << name;
-      else
-        os << info->node->GetId ();
+      os << info->node->GetId () << "(" << Names::FindName (info->node) << ")";
+      // std::string name = Names::FindName (info->node);
+      // if (!name.empty ())
+      //   os << name;
+      // else
+      //   os << info->node->GetId ();
       os << ":" << info->weight;
     }
 }