Fix segment name to support more than 9 parts

Zero-padding the segment number to 5 digits allows to support the minimum chunk size of 1MB and the maximum of 5GB.
Without padding, when retrieving a file segmented in 10 or more segments, it will be reassembled in the wrong order and thus will be rendered useless.

Author: evach-vf

lib/OpenCloud/ObjectStore/Upload/TransferPart.php

@@ -135,7 +135,7 @@ public function getPath()
      */
     public static function createRequest($part, $number, $client, $options)
     {
-        $name = sprintf('%s/%s/%d', $options['objectName'], $options['prefix'], $number);
+        $name = sprintf('%s/%s/%05d', $options['objectName'], $options['prefix'], $number);
         $url = clone $options['containerUrl'];
         $url->addPath($name);