docs: def absent(name, bridge=None):
      '''
      Ensures that the named port exists on bridge, eventually deletes it.
      If bridge is not set, port is removed from  whatever bridge contains it.
  
      Args:
          name: The name of the port.
          bridge: The name of the bridge.
  
      '''
      ret = {'name': name, 'changes': {}, 'result': False, 'comment': ''}
      bridge_exists = False
      if bridge:
          bridge_exists = __salt__['openvswitch.bridge_exists'](bridge)
          if bridge_exists:
              port_list = __salt__['openvswitch.port_list'](bridge)
          else:
              port_list = ()
      else:
          port_list = [name]
  
      # Comment and change messages
      comments = {}
      comments['comment_bridge_notexists'] = 'Bridge {0} does not exist.'.format(bridge)
      comments['comment_port_notexists'] = 'Port {0} does not exist on bridge {1}.'.format(name, bridge)
      comments['comment_port_deleted'] = 'Port {0} deleted.'.format(name)
      comments['comment_port_notdeleted'] = 'Unable to delete port {0}.'.format(name)
      comments['changes_port_deleted'] = {name: {'old': 'Port named {0} may exist.'.format(name),
                                     'new': 'Deleted port {0}.'.format(name),
                                     }
                              }
  
      # Dry run, test=true mode
      if __opts__['test']:
          if bridge and not bridge_exists:
              ret['result'] = None
              ret['comment'] = comments['comment_bridge_notexists']
          elif name not in port_list:
              ret['result'] = True
              ret['comment'] = comments['comment_port_notexists']
          else:
              ret['result'] = None
              ret['comment'] = comments['comment_port_deleted']
          return ret
  
      if bridge and not bridge_exists:
          ret['result'] = False
          ret['comment'] = comments['comment_bridge_notexists']
      elif name not in port_list:
          ret['result'] = True
          ret['comment'] = comments['comment_port_notexists']
      else:
          if bridge:
              port_remove = __salt__['openvswitch.port_remove'](br=bridge, port=name)
          else:
              port_remove = __salt__['openvswitch.port_remove'](br=None, port=name)
  
          if port_remove:
              ret['result'] = True
              ret['comment'] = comments['comment_port_deleted']
              ret['changes'] = comments['changes_port_deleted']
          else:
              ret['result'] = False
              ret['comment'] = comments['comment_port_notdeleted']
  
      return ret