Merge branch 'stable-2.5'

* stable-2.5:
  Create ref for patch set that is created when a change is cherry-picked
  Add missing mail template examples to site init
  Fix: Projects created outside of Gerrit could not be cloned.
  Remove red background for outdated dependency after rebase
  Don't remove dashes from approval category name.
  Add `--is-draft` argument on patchset-created hook
  Add change topic in hook arguments
  Update the Gerrit 2.5 release notes for rc1