model: Change default behavior to cache unsolicited data from local applications

In many cases, when a real NDN application is written, it is desirable
to be able to push content to the local cache (e.g., "pre-publish").

http://redmine.named-data.net/projects/ndnsim refs #1002
diff --git a/model/fw/ndn-forwarding-strategy.h b/model/fw/ndn-forwarding-strategy.h
index a3fe5b5..f077332 100644
--- a/model/fw/ndn-forwarding-strategy.h
+++ b/model/fw/ndn-forwarding-strategy.h
@@ -476,6 +476,7 @@
   Ptr<Fib> m_fib; ///< \brief FIB
   Ptr<ContentStore> m_contentStore; ///< \brief Content store (for caching purposes only)
 
+  bool m_cacheUnsolicitedDataFromApps;
   bool m_cacheUnsolicitedData;
   bool m_detectRetransmissions;