Cluster: always add PFAIL nodes at end of gossip section.
To rely on the fact that nodes in PFAIL state will be shared around by randomly adding them in the gossip section is a weak assumption, especially after changes related to sending less ping/pong packets. We want to always include gossip entries for all the nodes that are in PFAIL state, so that the PFAIL -> FAIL state promotion can happen much faster and reliably. Related to #3929.
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