OCPBUGS-13810: Update TestAWSELBConnectionIdleTimeout to not use wild…

…card DNS record

TestAWSELBConnectionIdleTimeout has been very flakey due to the fact that the
CI test runner cluster is failing to resolve the newly created wildcard DNS Record
in a reasonable time. To work around this, we switch to using ELB's hostname,
which is consistently resolving and adding the "Host" header to the HTTP request

`test/e2e/operator_test.go`: Modify TestAWSELBConnectionIdleTimeout to use
ELB hostname and Host header with route hostname

test/e2e/operator_test.go

@@ -2641,10 +2641,17 @@ func TestAWSELBConnectionIdleTimeout(t *testing.T) {
 		t.Fatalf("expected %s=%s, found %s=%s", key, expected, key, v)
 	}
 
-	// Make sure we can resolve the route's host name.  It may take some
-	// time for the ingresscontroller's wildcard DNS record to propagate.
+	// Get the ELB's hostname via the wildcard DNS record
+	wildcardRecordName := controller.WildcardDNSRecordName(ic)
+	wildcardRecord := &iov1.DNSRecord{}
+	if err := kclient.Get(context.TODO(), wildcardRecordName, wildcardRecord); err != nil {
+		t.Fatalf("failed to get wildcard dnsrecord %s: %v", wildcardRecordName, err)
+	}
+	elbHostname := wildcardRecord.Spec.Targets[0]
+
+	// Wait until we can resolve the ELB's hostname
 	if err := wait.PollImmediate(5*time.Second, 5*time.Minute, func() (bool, error) {
-		_, err := net.LookupIP(route.Spec.Host)
+		_, err := net.LookupIP(elbHostname)
 		if err != nil {
 			t.Log(err)
 			return false, nil
@@ -2657,10 +2664,14 @@ func TestAWSELBConnectionIdleTimeout(t *testing.T) {
 
 	// Open a connection to the route, send a request, and verify that the
 	// connection times out after ~10 seconds.
-	request, err := http.NewRequest("GET", "http://"+route.Spec.Host, nil)
+	request, err := http.NewRequest("GET", "http://"+elbHostname, nil)
 	if err != nil {
 		t.Fatalf("failed to create HTTP request: %v", err)
 	}
+	// Add the "Host" header to direct request to ELB to the route we are testing which bypasses the need
+	// for the wildcard DNS record to propagate to the CI test runner cluster's DNS servers which has gotten very slow.
+	// See https://issues.redhat.com/browse/OCPBUGS-13810
+	request.Host = route.Spec.Host
 
 	client := &http.Client{}