config: prevent use of windows reserved names in config file name

lib/file/file_other.go

@@ -13,3 +13,8 @@ import "os"
 // Under both Unix and Windows this will allow open files to be
 // renamed and or deleted.
 var OpenFile = os.OpenFile
+
+// IsReserved checks if path contains a reserved name
+func IsReserved(path string) error {
+	return nil
+}