* Enable start if one upstream resolver fails
* Will now check if upstream actually works
* Fixed default upstream in some tests
* Increase timeouts in some tests
* change default value of "StartVerifyUpstream" to false
Co-authored-by: Dimitri Herzog <dimitri.herzog@gmail.com>
This commit extracts rewriting logic from `ConditionalUpstreamResolver`
into the new `RewriterResolver`, and uses that to enable rewriting for
the `CustomDNSResolver`.
`RewriterResolver` wraps a resolver and applies the rewrite to the
request that is forwarded to the inner resolver.
It also introduces a new optional interface: `NamedResolver`.
This allows a `Resolver` to choose what its user friendly name is,
instead of always being its type name.
Changes:
- added cache.cacheTimeNegative (time.Duration)
- if not configured the default cache time stays at 30 min
- if set to a value below zero caching of negative responses is disabled
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