HNC dnsPolicy with hostNetwork

[dhorner71]

Hi @jouve. I didn't realize we would need dnsPolicy = ClusterFirstWithHostNet if hostNetwork = true. Seem like default value is dnsPolicy = ClusterFirst if none is specified.

sample templating taken from cert-manager:

{{- if .Values.hostNetwork }}
hostNetwork: true
{{- end }}
{{- if .Values.hostNetwork }}
dnsPolicy: ClusterFirstWithHostNet
{{- end }}

cert-manager reference: 
https://github.com/cert-manager/cert-manager/blob/master/deploy/charts/cert-manager/templates/webhook-deployment.yaml#L73-L78

Thank you for your previous consideration and community work!