Add branch to local clone path of git repositories for now.

Dependencies

• [2] ARD6Z67T Do incremental SVN checkouts
• [3] C7CXMZ66 hydra: do not perform git clone every time. in stead work on local clone and pull
• [4] UO67NQMR Change `fetchInputGit' to do `git clone -b BRANCH' instead of `git clone'.
• [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] TM6XBAG2 git branches can share local clones
• [*] OOQ2D3KC * Refactoring: move fetchInput out of hydra_scheduler into a separate

Change contents

• replacement in src/lib/Hydra/Helper/AddBuilds.pm at line 326
  [3.124]→[2.1178:1232](∅→∅)
  − my $clonePath = scmPath . "/" . sha256_hex($uri);
  [3.124]

  [3.179]
  + my $clonePath = scmPath . "/" . sha256_hex($uri.$branch);