add support for externalTrafficPolicy on service #220
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What this PR does / why we need it:
This adds support for the externalTrafficPolicy setting for the service resources. Setting externalTrafficPolicy to local preserves the client ip for the pod (https://kubernetes.io/docs/tasks/access-application-cluster/create-external-load-balancer/#preserving-the-client-source-ip)
I don't think this fixes any open issues, but it resolves an issue I have this helm chart (Client IPs are not preserved for purposes of logging device accessing ldap through the loadbalancer service)
Pre-submission checklist: