ExecuteClamCommandAsync does not use CancellationToken when waiting for response from clamavd

[robertbaumann]

nClam/nClam/ClamClient.cs

Line 96 in 9a99b6a

result = await reader.ReadToEndAsync().ConfigureAwait(false);

When passing a CancellationToken with a timer to avoid waiting > n seconds for long-running scans, the ReadToEndAsync() does not get passed the cancellationToken, resulting in the task not cancelling.