Cluster: use the node blacklist in CLUSTER FORGET.
CLUSTER FORGET is not useful if we can't remove a node from all the nodes of our cluster because of the Gossip protocol that keeps adding a given node to nodes where we already tried to remove it. So now CLUSTER FORGET implements a nodes blacklist that is set and checked by the Gossip section processing function. This way before a node is re-added at least 60 seconds must elapse since the FORGET execution. This means that redis-trib has some time to remove a node from a whole cluster. It is possible that in the future it will be uesful to raise the 60 sec figure to something bigger.
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