UPSTREAM: <carry>: Fix tests after backport

When backporting some changes from upstream's master branch a unit test
ended up being broken. The code covered by this test does not seem to
exist upstream, neither the test file.

The code this commit fixes was introduced by 57c60d8 and we should
squash this one with it once the time for rebasing arrives.

Even though 57c60d8 description reads "UPSTREAM: 115328: annotate early
and late requests" the upstream PR 115328 was closed without merging.

Author: ricardomaraschini

staging/src/k8s.io/apiserver/pkg/server/filters/with_early_late_annotations_test.go

@@ -257,9 +257,7 @@ func TestWithStartupEarlyAnnotation(t *testing.T) {
 			if ac == nil {
 				t.Fatalf("expected audit context inside the request context")
 			}
-			ac.Event = auditinternal.Event{
-				Level: auditinternal.LevelMetadata,
-			}
+			ac.Init(audit.RequestAuditConfig{Level: auditinternal.LevelMetadata}, nil)
 
 			w := httptest.NewRecorder()
 			w.Code = 0
@@ -275,11 +273,11 @@ func TestWithStartupEarlyAnnotation(t *testing.T) {
 			key := "apiserver.k8s.io/startup"
 			switch {
 			case len(test.annotationExpected) == 0:
-				if valueGot, ok := ac.Event.Annotations[key]; ok {
+				if valueGot, ok := ac.GetEventAnnotation(key); ok {
 					t.Errorf("did not expect annotation to be added, but got: %s", valueGot)
 				}
 			default:
-				if valueGot, ok := ac.Event.Annotations[key]; !ok || test.annotationExpected != valueGot {
+				if valueGot, ok := ac.GetEventAnnotation(key); !ok || test.annotationExpected != valueGot {
 					t.Errorf("expected annotation: %s, but got: %s", test.annotationExpected, valueGot)
 				}
 			}