util-lib: move more file I/O related calls into fileio.[ch]

src/core/cgroup.c

@@ -25,6 +25,7 @@
 #include "cgroup-util.h"
 #include "cgroup.h"
 #include "fd-util.h"
+#include "fileio.h"
 #include "parse-util.h"
 #include "path-util.h"
 #include "process-util.h"

src/core/dbus-cgroup.c

@@ -24,6 +24,7 @@
 #include "cgroup.h"
 #include "dbus-cgroup.h"
 #include "fd-util.h"
+#include "fileio.h"
 #include "path-util.h"
 
 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_cgroup_device_policy, cgroup_device_policy, CGroupDevicePolicy);

src/core/dbus-manager.c

@@ -35,6 +35,7 @@
 #include "dbus.h"
 #include "env-util.h"
 #include "fd-util.h"
+#include "fileio.h"
 #include "formats-util.h"
 #include "install.h"
 #include "log.h"

src/core/dbus-service.c

@@ -26,6 +26,7 @@
 #include "dbus-kill.h"
 #include "dbus-service.h"
 #include "fd-util.h"
+#include "fileio.h"
 #include "path-util.h"
 #include "service.h"
 #include "string-util.h"

src/core/ima-setup.c

@@ -25,6 +25,7 @@
 #include <errno.h>
 
 #include "fd-util.h"
+#include "fileio.h"
 #include "ima-setup.h"
 #include "log.h"
 #include "util.h"

src/core/manager.c

@@ -54,6 +54,7 @@
 #include "escape.h"
 #include "exit-status.h"
 #include "fd-util.h"
+#include "fileio.h"
 #include "hashmap.h"
 #include "io-util.h"
 #include "locale-setup.h"