hydra: do not use refs/heads while checking for latest commit in branch

Dependencies

• [2] C7CXMZ66 hydra: do not perform git clone every time. in stead work on local clone and pull
• [3] BK24VA6Q * for git inputs, check latest revision of branch (defaults to master for now), if there is change, only use input if last checkout was > hour ago.
• [4] KQS7DSKJ * Clean up indentation.
• [5] CHQEG6WY Hydra/29: Added timeout to svn/git checkouts, job evaluation
• [6] JTRG7RDQ add support for git as jobinput
• [*] OOQ2D3KC * Refactoring: move fetchInput out of hydra_scheduler into a separate

Change contents

• replacement in src/lib/Hydra/Helper/AddBuilds.pm at line 321
  [2.624]→[2.624:783](∅→∅)
  − ("git", "ls-remote", $clonePath, "refs/heads/".$branch));

  − die "Cannot get head revision of Git branch '$branch' at `$uri':\n$stderr" unless $res1;
  [2.624]

  [3.515]
  + ("git", "ls-remote", $clonePath, $branch));

  +

  + die "Cannot get head revision of Git branch '$branch' at `$uri':\n$stderr" unless $res1 ;
• replacement in src/lib/Hydra/Helper/AddBuilds.pm at line 325
  [3.516]→[3.309:359](∅→∅)
  − (my $revision, my $ref) = split ' ', $stdout;
  [3.516]

  [3.359]
  + my ($first) = split /\n/, $stdout;

  + (my $revision, my $ref) = split ' ', $first;