Allow use of a single Git clone for several branches.

Dependencies

• [2] 3I6BNF4S hydra: do not use refs/heads while checking for latest commit in branch
• [3] HABC6L4G Revert "Use git fetch --all to update local clone in stead of git pull. Also, do not use --branch in initial clone."
• [4] VJ4BZV5R Add branch to local clone path of git repositories for now.
• [5] 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.
• [6] BMSQD2ZH Indentation
• [7] CHQEG6WY Hydra/29: Added timeout to svn/git checkouts, job evaluation
• [8] ARD6Z67T Do incremental SVN checkouts
• [9] C7CXMZ66 hydra: do not perform git clone every time. in stead work on local clone and pull
• [10] TM6XBAG2 git branches can share local clones
• [11] UO67NQMR Change `fetchInputGit' to do `git clone -b BRANCH' instead of `git clone'.
• [12] PNPT3Y7R Use git fetch --all to update local clone in stead of git pull. Also, do not use --branch in initial clone.
• [*] OOQ2D3KC * Refactoring: move fetchInput out of hydra_scheduler into a separate
• [*] JTRG7RDQ add support for git as jobinput

Change contents

• replacement in src/lib/Hydra/Helper/AddBuilds.pm at line 326
  [5.124]→[4.0:62](∅→∅)
  − my $clonePath = scmPath . "/" . sha256_hex($uri.$branch);
  [5.124]

  [5.179]
  + my $clonePath = scmPath . "/" . sha256_hex($uri);
• replacement in src/lib/Hydra/Helper/AddBuilds.pm at line 338
  [5.175]→[3.71:97](∅→∅)
  − ("git", "pull"));
  [5.175]

  [5.483]
  + ("git", "pull", "--all"));
• edit in src/lib/Hydra/Helper/AddBuilds.pm at line 346
  [15.516]

  [2.152]
  + # Take the first commit ID returned by `ls-remote'. The

  + # assumption is that `ls-remote' returned both `refs/heads/BRANCH'

  + # and `refs/remotes/origin/BRANCH', and that both point at the

  + # same commit.