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/other/face-benchmark.cpp b/tests/other/face-benchmark.cpp
index 19aac7c..3ab1dda 100644
--- a/tests/other/face-benchmark.cpp
+++ b/tests/other/face-benchmark.cpp
@@ -23,7 +23,7 @@
  * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "core/global-io.hpp"
+#include "daemon/global.hpp"
 #include "face/face.hpp"
 #include "face/tcp-channel.hpp"
 #include "face/udp-channel.hpp"