added ingress classes

Done using:
```
helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
helm repo update

helm install ingress-nginx ingress-nginx/ingress-nginx
```

etc/k8s/helm-chart/eventhub/charts/account/templates/account-ingress.yaml

@@ -3,6 +3,7 @@ kind: Ingress
 metadata:
   name: {{ .Release.Name }}-{{ .Chart.Name }}-ingress
   annotations:
+    kubernetes.io/ingress.class: nginx
     nginx.ingress.kubernetes.io/rewrite-target: /
     nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
     nginx.ingress.kubernetes.io/proxy-buffer-size: "{{ .Values.global.nginxProxyBufferSize }}"

etc/k8s/helm-chart/eventhub/charts/admin-api/templates/admin-api-ingress.yaml

@@ -3,6 +3,7 @@ kind: Ingress
 metadata:
   name: {{ .Release.Name }}-{{ .Chart.Name }}-ingress
   annotations:
+    kubernetes.io/ingress.class: "nginx"
     nginx.ingress.kubernetes.io/rewrite-target: /
     nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
     nginx.ingress.kubernetes.io/proxy-buffer-size: "{{ .Values.global.nginxProxyBufferSize }}"

etc/k8s/helm-chart/eventhub/charts/admin/templates/admin-ingress.yaml

@@ -3,6 +3,7 @@ kind: Ingress
 metadata:
   name: {{ .Release.Name }}-{{ .Chart.Name }}-ingress
   annotations:
+    kubernetes.io/ingress.class: nginx
     nginx.ingress.kubernetes.io/rewrite-target: /
     nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
     nginx.ingress.kubernetes.io/proxy-buffer-size: "{{ .Values.global.nginxProxyBufferSize }}"

etc/k8s/helm-chart/eventhub/charts/api/templates/api-ingress.yaml

@@ -3,6 +3,7 @@ kind: Ingress
 metadata:
   name: {{ .Release.Name }}-{{ .Chart.Name }}-ingress
   annotations:
+    kubernetes.io/ingress.class: "nginx"
     nginx.ingress.kubernetes.io/rewrite-target: /
     nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
     nginx.ingress.kubernetes.io/proxy-buffer-size: "{{ .Values.global.nginxProxyBufferSize }}"

etc/k8s/helm-chart/eventhub/charts/www/templates/www-ingress.yaml

@@ -3,6 +3,7 @@ kind: Ingress
 metadata:
   name: {{ .Release.Name }}-{{ .Chart.Name }}-ingress
   annotations:
+    kubernetes.io/ingress.class: nginx
     nginx.ingress.kubernetes.io/rewrite-target: /
     nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
     nginx.ingress.kubernetes.io/proxy-buffer-size: "{{ .Values.global.nginxProxyBufferSize }}"