Sentinel: fix computation of total number of votes.
The code to check the number of voters was never updated to follow the new Sentinel specification, so the number of voters was computed using only the set of Sentinels that provided a vote. This means that there is a changing majority on partitions, even if usually the issue is not triggered because of the configured quorum check (what was broken was the other implicit check that requires anyway half of the known sentinels to agree in order to start a failover).
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