Cluster: discard pong times in the future.
However we allow for 500 milliseconds of tolerance, in order to avoid often discarding semantically valid info (the node is up) because of natural few milliseconds desync among servers even when NTP is used. Note that anyway we should ping the node from time to time regardless and discover if it's actually down from our point of view, since no update is accepted while we have an active ping on the node. Related to #3929.
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