c-ares / c-ares / #261

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Randomize retry penalties to prevent thundering herd type issues (#606)

The retry timeout values were using a fixed calculation which could cause multiple simultaneous queries to timeout and retry at the exact same time.  If a DNS server is throttling requests, this could cause the issue to never self-resolve due to all requests recurring at the same instance again.

This PR also creates a maximum timeout option to make sure the random value selected does not exceed this value.

Fix By: Ignat (@Kontakter)

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