util-lib: move a number of fs operations into fs-util.[ch]

src/libsystemd/sd-daemon/sd-daemon.c

@@ -36,6 +36,7 @@
 #include "sd-daemon.h"
 
 #include "fd-util.h"
+#include "fs-util.h"
 #include "parse-util.h"
 #include "path-util.h"
 #include "socket-util.h"

src/libsystemd/sd-device/device-private.c

@@ -29,6 +29,7 @@
 #include "device-util.h"
 #include "fd-util.h"
 #include "fileio.h"
+#include "fs-util.h"
 #include "hashmap.h"
 #include "macro.h"
 #include "mkdir.h"

src/libsystemd/sd-device/sd-device.c

@@ -29,6 +29,7 @@
 #include "device-util.h"
 #include "fd-util.h"
 #include "fileio.h"
+#include "fs-util.h"
 #include "hashmap.h"
 #include "macro.h"
 #include "parse-util.h"

src/libsystemd/sd-login/sd-login.c

@@ -28,10 +28,12 @@
 #include "sd-login.h"
 
 #include "cgroup-util.h"
+#include "dirent-util.h"
 #include "escape.h"
 #include "fd-util.h"
 #include "fileio.h"
 #include "formats-util.h"
+#include "fs-util.h"
 #include "hostname-util.h"
 #include "io-util.h"
 #include "login-util.h"
@@ -43,7 +45,6 @@
 #include "strv.h"
 #include "user-util.h"
 #include "util.h"
-#include "dirent-util.h"
 
 /* Error codes:
  *