core: reimplement logging using ndn-cxx's facility

Change-Id: Ifc7c5d70a61ad405dc1f1adfa522a2c0ad1586ab
Refs: #4580
diff --git a/tests/core/network-predicate.t.cpp b/tests/core/network-predicate.t.cpp
index d7ef008..a0a510e 100644
--- a/tests/core/network-predicate.t.cpp
+++ b/tests/core/network-predicate.t.cpp
@@ -24,6 +24,7 @@
  */
 
 #include "core/network-predicate.hpp"
+#include "core/config-file.hpp"
 
 #include "tests/test-common.hpp"