rib: reimplement auto prefix propagation based on readvertise

Change-Id: I6c4d81b829cf78084d26121c81d977d0a86c9a0c
Refs: #3819
diff --git a/rib/service.hpp b/rib/service.hpp
index 0b06013..e372a0d 100644
--- a/rib/service.hpp
+++ b/rib/service.hpp
@@ -40,7 +40,6 @@
 namespace nfd {
 namespace rib {
 
-class AutoPrefixPropagator;
 class Readvertise;
 
 /**
@@ -116,8 +115,8 @@
 
   Rib m_rib;
   FibUpdater m_fibUpdater;
-  unique_ptr<AutoPrefixPropagator> m_prefixPropagator;
   unique_ptr<Readvertise> m_readvertiseNlsr;
+  unique_ptr<Readvertise> m_readvertisePropagation;
   ndn::mgmt::Dispatcher m_dispatcher;
   RibManager m_ribManager;
 };