core+daemon: eliminate scheduler::{schedule,cancel} wrappers

Also move core/global-io.hpp to daemon/global.hpp

Refs: #4528, #4883
Change-Id: I0b99029f1a19d7451aab57099cd3303b7eb42ff3
diff --git a/tests/daemon/rib/service.t.cpp b/tests/daemon/rib/service.t.cpp
index 14ee649..156257b 100644
--- a/tests/daemon/rib/service.t.cpp
+++ b/tests/daemon/rib/service.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2018,  Regents of the University of California,
+ * Copyright (c) 2014-2019,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -24,8 +24,10 @@
  */
 
 #include "rib/service.hpp"
-#include "tests/rib-io-fixture.hpp"
+#include "daemon/global.hpp"
+
 #include "tests/test-common.hpp"
+#include "tests/daemon/rib-io-fixture.hpp"
 
 namespace nfd {
 namespace rib {