ingress: nginx controller watches referenced tls secrets

* reload certificates on change

controllers/nginx/utils.go

@@ -37,6 +37,11 @@ type StoreToIngressLister struct {
 	cache.Store
 }
 
+// StoreToSecretsLister makes a Store that lists Secrets.
+type StoreToSecretsLister struct {
+	cache.Store
+}
+
 // StoreToConfigmapLister makes a Store that lists Configmap.
 type StoreToConfigmapLister struct {
 	cache.Store