rib: provide self-learning helpers

refs #4683

Change-Id: Ib1e586a505d07a5e1f7a4b6d78306ea08b4dcda8
diff --git a/rib/service.hpp b/rib/service.hpp
index a349787..135df58 100644
--- a/rib/service.hpp
+++ b/rib/service.hpp
@@ -85,6 +85,12 @@
   static Service&
   get();
 
+  RibManager&
+  getRibManager()
+  {
+    return m_ribManager;
+  }
+
 private:
   template<typename ConfigParseFunc>
   Service(ndn::KeyChain& keyChain, shared_ptr<ndn::Transport> localNfdTransport,