Stopping bots with error procedure pass and pipeline errors

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Reported via intelmq-users

https://github.com/certtools/intelmq/blob/1.1.0/intelmq/lib/bot.py#L258

                        # error_procedure: pass and pipeline problem
                        else:
                            self.stop()

Should be revisited.

quoting myself: https://lists.cert.at/pipermail/intelmq-users/2018-October/000074.html

If the error_procedure
is pass and there are pipeline problems, the bot stops (in bot.py search
for "error_procedure: pass and pipeline problem"). AFAIR the reasoning
for this was/is that if the bot would not stop, the pipeline would be
kind of DOS'ed. But as problems with memory and snapshots in redis are
handled better now, that could be relaxed.

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Asked community for input: https://lists.cert.at/pipermail/intelmq-users/2018-October/000084.html

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Output: retry forever.