Fix few vet errors.

There are quite a few 'composite literal uses unkeyed fields' errors that I have kept out of this patch.
And there's a couple where vet just seems confused. These are the easiest ones.

plugin/pkg/scheduler/algorithmprovider/plugins_test.go

@@ -49,7 +49,7 @@ func TestAlgorithmProviders(t *testing.T) {
 			break
 		}
 		if len(p.PriorityFunctionKeys) == 0 {
-			t.Error("%s algorithm provider shouldn't have 0 priority functions", pn)
+			t.Errorf("%s algorithm provider shouldn't have 0 priority functions", pn)
 		}
 		for _, pf := range p.PriorityFunctionKeys.List() {
 			if !factory.IsPriorityFunctionRegistered(pf) {