UPSTREAM: <carry>: fix request Host storing in openshift.io/during-gr…

…aceful audit log annotation

request URL doesn't contain the host used in the request, instead it
should be fetched from request headers

Note for rebase: squash it into the following commit
a83d289 UPSTREAM: <carry>: annotate audit events for requests during unready phase and graceful termination phase

staging/src/k8s.io/apiserver/pkg/server/patch_genericapiserver.go

@@ -197,10 +197,10 @@ func WithLateConnectionFilter(handler http.Handler) http.Handler {
 		if late {
 			if pth := "/" + strings.TrimLeft(r.URL.Path, "/"); pth != "/readyz" && pth != "/healthz" && pth != "/livez" {
 				if isLocal(r) {
-					audit.AddAuditAnnotation(r.Context(), "openshift.io/during-graceful", fmt.Sprintf("loopback=true,%v,readyz=false", r.URL.Host))
+					audit.AddAuditAnnotation(r.Context(), "openshift.io/during-graceful", fmt.Sprintf("loopback=true,%v,readyz=false", r.Host))
 					klog.V(4).Infof("Loopback request to %q (user agent %q) through connection created very late in the graceful termination process (more than 80%% has passed). This client probably does not watch /readyz and might get failures when termination is over.", r.URL.Path, r.UserAgent())
 				} else {
-					audit.AddAuditAnnotation(r.Context(), "openshift.io/during-graceful", fmt.Sprintf("loopback=false,%v,readyz=false", r.URL.Host))
+					audit.AddAuditAnnotation(r.Context(), "openshift.io/during-graceful", fmt.Sprintf("loopback=false,%v,readyz=false", r.Host))
 					klog.Warningf("Request to %q (source IP %s, user agent %q) through a connection created very late in the graceful termination process (more than 80%% has passed), possibly a sign for a broken load balancer setup.", r.URL.Path, r.RemoteAddr, r.UserAgent())
 
 					// create only one event to avoid event spam.