NFD+model+apps+helper+tests: Upgrade NFD and related changes

Based on NFD:commit:2fc649bfc67b93b4191cfbee5bcd70330bfb48f0 (version 0.3.4)

Change-Id: I89f5182600467171797af4f8f83e1edffe14ad95
Refs: #3125
diff --git a/examples/ndn-simple.py b/examples/ndn-simple.py
index 295c1af..f8bf1ca 100644
--- a/examples/ndn-simple.py
+++ b/examples/ndn-simple.py
@@ -67,7 +67,7 @@
 ndnHelper.InstallAll()
 
 # Choosing forwarding strategy
-ndn.StrategyChoiceHelper.InstallAll("/prefix", "/localhost/nfd/strategy/broadcast")
+ndn.StrategyChoiceHelper.InstallAll("/prefix", "/localhost/nfd/strategy/multicast")
 
 # Installing applications