Merge branch 'devel-2.2'

* devel-2.2:
  setup-ssh: fix updating of authorized_keys
  setup-ssh: Also use keys from the ssh-agent
  setup-ssh: try to use key auth first
  setup-ssh: redo the logging levels
  setup-ssh: only read the ssh port once
  setup-ssh: fix the logging error message
  Use Sphinx' :rfc: extension to refer to RFCs
  Document non-standard usage of JSON in RAPI
  Fix small spelling mistake
  Explicitly add dry-run to some commands
  Stop adding the dry-run option by default
  Fix a few commands behaviour with dry-run
  jqueue: Remove lock status field
  QA: Run simple job queue test
  Don't ignore secondary node silently
  etags: force Python as a language

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>