Problem: disconnecting client causes panic sometimes

[odesenfans]

Disconnecting a client abruptly can cause a panic.

Command receiver should not to be dropped: SendError { kind: Disconnected }

[odesenfans]

This error originates from expect calls on the sender/receiver queues used to communicate with the P2P background task. Most of the issue is already fixed by #55 but the error could still occur when the service boots.