Alexander Neumann fc5439a37a cache: Ensure failed downloads are retried ...

This fixes #1833, which consists of two different bugs:

 * The `defer` in `cacheFile()` may remove a channel from the
   `inProgress` map although it is not responsible for downloading the
   file

 * If the download fails, goroutines waiting for the file to be cached
   assumed that the file was there, there was no way to signal the
   error.

2018-06-09 17:50:56 +02:00

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