* stable-2.6: (72 commits)
  Make Ganeti 2.6.0 rc3 release
  Allow reinstall even when secondaries are offline
  Prepare NEWS file for Ganeti 2.6.0 rc3
  QA updated to test instance removing when sec. is offline
  Ignore offline node errors when removing disks
  Allow instance disc activation with offline secondaries
  RAPI regression beparams/memory fix
  Fix redistribution of files w.r.t. offline nodes
  Fix cluster verify error on master-ip-setup script
  Add a Makefile rule to test unclean git status
  Add test helpers to .gitignore
  Fix a typo in NEWS
  Release Ganeti 2.6.0rc2
  Prepare NEWS file for 2.6.0 rc2
  Update time on Haskell binaries after build
  hcheck: add two simple type aliases for readability
  hcheck: rework output mode
  hcheck: reword and fix typo in instance/offline msg
  Add hlint warning for wrong use of 'length'
  Remove can_rebalance functionality from hcheck
  ...

Conflicts:
        htools/Ganeti/HTools/QC.hs: due to the cleanup of missing type
        signatures, and the fact that in master two test functions had
        a changed argument list, trivial to fix

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>