Handle exceptions in client._task_network_consumer #281
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When exceptions bubble up to _task_network_consumer, log them and close the connection.
This prevents the network consumer becoming unresponsive in the face of unhandled exceptions, which then surface as TimeoutErrors to GivTCP processes which are waiting on responses from the inverter.
This is complementary to #280 - this PR on its own addresses the generic problem of unhandled exceptions killing the network consumer, if it's undesirable to merge #280.