hudson.tools.DownloadFromUrlInstaller#performInstallation
faild at call 'base.moveAllChildrenTo(expected)'
archived file example:
+- test +- sub +- sub
'test/sub'.moveAllChildrenTo('test') fail at hudson.FilePath
'test/sub/sub'.renameTo('test/') failed.
It caused by destination folder 'test/sub' that existed already.