* push logs to a swift storage with an automatic expiration
* call the publish part only once
* make rsync --quiet for a more compact playbook output
* make rsync upload optional
* fix full_logs template to include a slash at the end of the URL,
needed by the os-loganalyze server
* document new settings
Change-Id: If3dc99cce2b4386e9ed0ed1c47c7f4098ec43e5a