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

src/basic/mkdir.c

@@ -22,9 +22,10 @@
 #include <string.h>
 #include <errno.h>
 
-#include "util.h"
-#include "path-util.h"
+#include "fs-util.h"
 #include "mkdir.h"
+#include "path-util.h"
+#include "util.h"
 
 int mkdir_safe_internal(const char *path, mode_t mode, uid_t uid, gid_t gid, mkdir_func_t _mkdir) {
         struct stat st;