If we sent an age of 0 to clients, make sure we do not send more ages of 0 to the same clients until they've actually closed all their handles. This ensures that as more requests come in once we're low on fds, we don't send hundreds of 0 ages to the same clients erroneously. It also means that we always target the correct number of *unique* clients to ask to close their fds, which avoids thrashing the same clients and improves performance markedly.

Also, if on open, we send "close" back to the client, that client *is* blocked (actually, due to have 0 opens) as we know it'll close, send us some closed msgs and then re do the open call. Thus we shouldn't be sending it any set maximum age messages.

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