Add default backend in ingress nginx controller

Sem-Ver: fix
Change-Id: Iec6852ce716a1d5a1de1e8fb33be9d38a2219145
diff --git a/roles/ingress_nginx/tasks/main.yml b/roles/ingress_nginx/tasks/main.yml
index 6436383..0c886ad 100644
--- a/roles/ingress_nginx/tasks/main.yml
+++ b/roles/ingress_nginx/tasks/main.yml
@@ -37,3 +37,5 @@
           type: ClusterIP
         admissionWebhooks:
           port: 7443
+      defaultBackend:
+        enabled: true