Add serviceNameOverride (#3802)

(cherry picked from commit 5517f66)

Author: timnee

deployments/helm-chart/templates/controller-service.yaml

@@ -2,7 +2,7 @@
 apiVersion: v1
 kind: Service
 metadata:
-  name: {{ include "nginx-ingress.controller.fullname" . }}
+  name: {{ default (include "nginx-ingress.controller.fullname" .) .Values.serviceNameOverride }}
   namespace: {{ .Release.Namespace }}
   labels:
     {{- include "nginx-ingress.labels" . | nindent 4 }}