docs: def property_present(name, property, value):
      '''
      Ensure property has a certain value
  
      name : string
          name of the zone
      property : string
          name of property
      value : string
          value of property
  
      '''
      ret = {'name': name,
             'changes': {},
             'result': None,
             'comment': ''}
  
      ## sanitize input
      value = _parse_value(value)
  
      zones = __salt__['zoneadm.list'](installed=True, configured=True)
      if name in zones:
          ## zone exists
          zonecfg = __salt__['zonecfg.info'](name, show_all=True)
          if property not in zonecfg or zonecfg[property] != _parse_value(value):
              if __opts__['test']:
                  ret['result'] = True
              else:
                  # update property
                  zonecfg_res = __salt__['zonecfg.set_property'](name, property, value)
                  ret['result'] = zonecfg_res['status']
                  if 'messages' in zonecfg_res:
                      ret['comment'] = zonecfg_res['message']
              if ret['result']:
                  ret['changes'][property] = _parse_value(value)
                  if ret['comment'] == '':
                      ret['comment'] = 'The property {0} is was updated to {1}.'.format(property, value)
              elif ret['comment'] == '':
                  if ret['comment'] == '':
                      ret['comment'] = 'The property {0} is was not updated to {1}!'.format(property, value)
          else:
              ret['result'] = True
              ret['comment'] = 'The property {0} is already set to {1}.'.format(property, value)
      else:
          ## zone does not exist
          ret['result'] = False
          ret['comment'] = 'The zone {0} is not in the configured, installed, or booted state.'.format(name)
  
      return ret