`requestCloseChannel()` and `CancelledError`

[iAmGroute]

When a request is pending and link drops:

1604085298.3 [00000073] DataEndpoint:    Finishing        ()
1604085298.3 [00000000] Loop:            Enqueue          (8,)
1604085298.3 [00000000] Loop:            Running          (8, 'requestCloseChannel ControlEndpoint:129')
1604085298.3 [00000000] Loop:            NewFuture        ()
1604085298.3 [00000000] Loop:            Paused           (8, 'requestCloseChannel ControlEndpoint:136')
.
1604085298.4 [00000066] Connector:       Error            (ConnectionResetError(104, 'Connection reset by peer'),)
1604085298.403 [Portal.Link    ]    Connection lost, reason: Closed by other end
1604085298.404 [Portal.Link    ]    Reconnecting
1604085298.4 [00000000] Loop:            Enqueue          (10,)
1604085298.4 [00000000] Loop:            Running          (10, 'reconnect Link:163')
1604085298.4 [0000002A] Link:            Disconnect       ()
1604085298.4 [00000066] Connector:       [Log deleted]
1604085298.4 [00000000] Loop:            Enqueue          (8,)
1604085298.4 [00000073] DataEndpoint:    [Log deleted]
1604085298.4 [00000076] Connector:       [Log deleted]
1604085298.4 [0000002A] Link:            Connect          (None,)
1604085298.4 [00000000] Loop:            NewFuture        ()
1604085298.4 [00000000] Loop:            Paused           (10, 'reconnect Link:165, __call__ Event:26, _connect Link:62, _connect_p1 Link:74, requestRelay Portal:241')
1604085298.4 [00000000] Loop:            Running          (8, 'requestCloseChannel ControlEndpoint:136')
1604085298.4 [00000000] Loop:            RunError         (CancelledError(),)
.