core: reimplement logging using ndn-cxx's facility

Change-Id: Ifc7c5d70a61ad405dc1f1adfa522a2c0ad1586ab
Refs: #4580
diff --git a/rib/rib.cpp b/rib/rib.cpp
index a2a27fb..d6b125b 100644
--- a/rib/rib.cpp
+++ b/rib/rib.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2014-2017,  Regents of the University of California,
+/*
+ * Copyright (c) 2014-2018,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -24,15 +24,14 @@
  */
 
 #include "rib.hpp"
-
 #include "fib-updater.hpp"
 #include "core/logger.hpp"
 
-NFD_LOG_INIT("Rib");
-
 namespace nfd {
 namespace rib {
 
+NFD_LOG_INIT(Rib);
+
 bool
 operator<(const RibRouteRef& lhs, const RibRouteRef& rhs)
 {
@@ -52,9 +51,7 @@
 {
 }
 
-Rib::~Rib()
-{
-}
+Rib::~Rib() = default;
 
 void
 Rib::setFibUpdater(FibUpdater* updater)