[dns-operations] More Aggressive prefetch for popular names

[Davey Song]

I also heard this policy is used by some ISPs as a excuse of "stealing" the
traffic or kind of rent-seeking for purging cache.  It's complex and not a
pure technical problem.

Davey

> Sometimes the long time stale response is caused by a sensitive "use stale
> response when encounter timeout or servfail to authoriative nameserver"
> policy
>
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