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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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@@ -19,18 +19,12 @@ func TestSetupNsid(t *testing.T) {
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expectedData string
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expectedErrContent string // substring from the expected error. Empty for positive cases.
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}{
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{
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`nsid`, false, defaultNsid, "",
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},
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{
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`nsid "ps0"`, false, "ps0", "",
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},
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{
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`nsid "worker1"`, false, "worker1", "",
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},
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{
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`nsid "tf 2"`, false, "tf 2", "",
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},
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{`nsid`, false, defaultNsid, ""},
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{`nsid "ps0"`, false, "ps0", ""},
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{`nsid "worker1"`, false, "worker1", ""},
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{`nsid "tf 2"`, false, "tf 2", ""},
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{`nsid
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nsid`, true, "", "plugin"},
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}
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for i, test := range tests {
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