make mixed-wireless examples use InternetStackHelper::Reset

examples/mixed-wireless.cc

@@ -164,7 +164,7 @@ main (int argc, char *argv[])
   internet.Install (backbone);
 
   // re-initialize for non-olsr routing.
-  internet = InternetStackHelper ();
+  internet.Reset ();
 
   //
   // Assign IPv4 addresses to the device drivers (actually to the associated

examples/mixed-wireless.py

@@ -130,6 +130,8 @@ def main(argv):
     olsr = ns3.OlsrHelper()
     internet.SetRoutingHelper(olsr);
     internet.Install(backbone);
+    # re-initialize for non-olsr routing.
+    internet.Reset()
     # 
     #  Assign IPv4 addresses to the device drivers(actually to the associated
     #  IPv4 interfaces) we just created.