David Turner 879e26ec06 Describe STALE_STATE_CONFIG in ClusterFormationFH (#53878)
We mark cluster states persisted on master-ineligible nodes as
potentially-stale using the voting configuration `{STALE_STATE_CONFIG}` which
prevents these nodes from being elected as master if they are restarted as
master-eligible. Today we do not handle this special voting configuration
differently in the `ClusterFormationFailureHandler`, leading to a mysterious
message `an election requires a node with id [STALE_STATE_CONFIG]` if the
election does not succeed.

This commit adds a special case description for this situation to explain
better why this node cannot win an election.

Closes #53734
2020-03-20 20:02:51 +01:00
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