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/daemon/face/unix-stream-channel.cpp b/daemon/face/unix-stream-channel.cpp
index 172f797..52a4c99 100644
--- a/daemon/face/unix-stream-channel.cpp
+++ b/daemon/face/unix-stream-channel.cpp
@@ -26,7 +26,7 @@
 #include "unix-stream-channel.hpp"
 #include "generic-link-service.hpp"
 #include "unix-stream-transport.hpp"
-#include "core/global-io.hpp"
+#include "daemon/global.hpp"
 
 #include <boost/filesystem.hpp>
 #include <sys/stat.h> // for chmod()