Code review comment for lp:~fginther/jenkins-launchpad-plugin/wait-for-node

This doesn't work right due to some authorization issue:
Traceback (most recent call last):
  File "/var/lib/jenkins/jenkins-launchpad-plugin-wfn/waitForNodeIdle.py", line 95, in <module>
    sys.exit(main())
  File "/var/lib/jenkins/jenkins-launchpad-plugin-wfn/waitForNodeIdle.py", line 87, in main
    mark_offline(json_jenkins, args.url, args.node)
  File "/var/lib/jenkins/jenkins-launchpad-plugin-wfn/waitForNodeIdle.py", line 46, in mark_offline
    data = json_jenkins.get_json_data(offline_url, False)
  File "/var/lib/jenkins/jenkins-launchpad-plugin-wfn/jsonjenkins.py", line 19, in get_json_data
    data = urllib2.urlopen(url)
  File "/usr/lib/python2.7/urllib2.py", line 126, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 406, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 519, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 444, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 378, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 527, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
urllib2.HTTPError: HTTP Error 403: Forbidden

It's the call to load http://{server}/computer/{node}/toggleOffline which works fine when triggered from a browser. Yes, I know that get_json_data isn't the right call for this, but it's failing on the urlopen method, not the json.loads method.

The alternative solution is to call jenkins-cli from within the python script. I don't want to do that as it's mixing two APIs when a pure web based solution should work.