Process Ingress with bitpoke-stack annotation

We've migrated to `.spec.ingressClassName` but for backward
compatibility we should process ingress resources with
`kubernetes.io/ingress.class` as well (eg. ingresses created by
cert-manager)

Author: calind

deploy/charts/stack/values.yaml

@@ -29,7 +29,7 @@ nginx-ingress:
     publishService:
       enabled: true
     extraArgs:
-      ingress-class: bitpoke.io/stack
+      ingress-class: bitpoke-stack
       default-ssl-certificate: bitpoke-stack/stack-ingress-default
   defaultBackend:
     enabled: true