code: def __metadata_helper(json_path):
      
      url = shakedown.dcos_url_path('dcos-metadata/{}'.format(json_path))
      try:
          response = dcos.http.request('get', url)
  
          if response.status_code == 200:
              return response.json()
      except:
          pass
  
      return None
docs: Returns json for specific cluster metadata.  Important to realize that
          this was introduced in dcos-1.9.  Clusters prior to 1.9 and missing metadata
          will return None