Move X-Forwarded-Port variable to the location context

Resolves issue #4038 where the X-Forwarded-Port header would be set to the value of the https listening port if all of the following settings were satisfied:
- The ingress controller was started with a non-default HTTPS port set with the `--https-port` argument
- An ingress is created having:
  - the `nginx.ingress.kubernetes.io/auth-url` annotation set
  - TLS enabled

This commit solves this issue by moving the setting of the `pass_server_port` variable from the server, one level down to the location context.

test/e2e/framework/framework.go

@@ -103,7 +103,7 @@ func (f *Framework) BeforeEach() {
 	f.Namespace = ingressNamespace
 
 	By("Starting new ingress controller")
-	err = f.NewIngressController(f.Namespace)
+	err = f.NewIngressController(f.Namespace, f.BaseName)
 	Expect(err).NotTo(HaveOccurred())
 
 	err = WaitForPodsReady(f.KubeClientSet, DefaultTimeout, 1, f.Namespace, metav1.ListOptions{