Hiding exceptions is *bad* .

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This condition is always true as the primary_node was found by UUID.

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This fixes strange epoll results (yielding unknown file descriptors).
There is no explanation as of why it worked in 64bits until now.

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Consequence of previous commit, to preserve code clarity.

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This state was only internal to master node, and was not even
consistently handled in master (only the first election was done in that
state).
changeClusterState was never called with that state as parameter.
Finally, remove this state from protocol as it's not used any longer.

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So that unknown nodes, to which no connection succeed for the current election, are dropped from election process.

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- Nodes start in UNKNOWN state.
- Running and Unknown nodes are candidates during election.
- Set temporarily down if an established connection is lost.
- Keep in unknown state if a connection fails.

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After the AnswerPrimary was received, the unconnected_master_node_set was filled with the primary address, causing a new connection at the next iteration in the _doElection method.

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A single fd might be reported more than once per epoll call. This causes
the associated connection to be registered multiple times, which in turn
causes problems when the first connection registration gets emptied:
handling events of the second registration will raise an error when trying
to fetch a packet from an empty list.

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