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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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@@ -16,6 +16,8 @@ For more information, please see [Go's pprof
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documentation](https://golang.org/pkg/net/http/pprof/) and read
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[Profiling Go Programs](https://blog.golang.org/profiling-go-programs).
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This plugin can only be used once per Server Block.
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## Syntax
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~~~
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