hydra: run nix-prefetch-git on local clone of git repo

Dependencies

• [2] CHQEG6WY Hydra/29: Added timeout to svn/git checkouts, job evaluation
• [3] KQS7DSKJ * Clean up indentation.
• [4] WWUOQ7V4 * hydra: indentation and fixed duplicate key in cachedgitinputs bug
• [*] OOQ2D3KC * Refactoring: move fetchInput out of hydra_scheduler into a separate

Change contents

• replacement in src/lib/Hydra/Helper/AddBuilds.pm at line 359
  [2.299]→[2.299:351](∅→∅)
  − ("nix-prefetch-git", $uri, $revision));
  [2.299]

  [3.7529]
  + ("nix-prefetch-git", $clonePath, $revision));