Correctly handle the carp demote counter in all input cases.

E.g. give up the MASTER status if there's a host with a lower
demote count, even if it has a higher advskew.
At the moment this shouldn't cause any change, but this is a
first step towards the removal of the
"bump the advskew to 240 in case of errors" hack,
without breaking backward compatibility.
OK henning@

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