Do not retry on failure to fetch

While we fixed the infinite retrying earlier, we still have
problems if we retry in the middle of a transfer, we might
end up resuming downloads that are already done and read
more than we should (removing the IsOpen() check so that
it always retries makes test-ubuntu-bug-1098738-apt-get-source-md5sum
fail with wrong file sizes).

I think the retrying was added to fixup pipelining messups,
but we have better solutions now, so let's get rid of it,
until we have implemented this properly.

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