Miek Gieben f697b33283 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

2018-02-28 18:16:05 -08:00

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