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return an error for multiple use of some plugins (#1559)
* plugins: Return error for multiple use of some Return plugin.ErrOnce when a plugin that doesn't support it, is called mutliple times. This now adds it for: cache, dnssec, errors, forward, hosts, nsid. And changes it slightly in kubernetes, pprof, reload, root. * more tests
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@@ -26,6 +26,8 @@ reloads are graceful, and can be disabled by setting the jitter to `0s`.
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Jitter is re-calculated whenever the Corefile is reloaded.
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This plugin can only be used once per Server Block.
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## Syntax
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~~~ txt
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