[jdk21] RFR: 8304885: Reuse stale data to improve DNS resolver resiliency

[Michael McMahon]

On Wed, 21 Jun 2023 14:50:21 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [bdd81b31](https://github.com/openjdk/jdk/commit/bdd81b31825a9eb6a0f0883fca56a011ac2aebf8) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Sergey Bylokhov on 9 Jun 2023 and was reviewed by Michael McMahon and Daniel Fuchs.
> 
> CSR is approved for JDK 21: https://bugs.openjdk.org/browse/JDK-8306653
> "jdk21-enhancement-yes" label is added to the JBS.
> 
> Thanks!

Marked as reviewed by michaelm (Reviewer).

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PR Review: https://git.openjdk.org/jdk21/pull/53#pullrequestreview-1494823853