Make Livy & Worker-lb ServiceType configurable

[belfhi]

Helo,
I install the Helm Chart for Spark from this repo and it seems to work well
but we don't have a Loadbalancer in our k8s cluster, so having the fixed value of
ServiceType: Loadbalancer does not work.
Having it configurable like the other svc would be great and maybe add an ingress for livy?
Cheers

[dbanda]

Thanks for the feedback. you can check the source of these charts here: https://github.com/dbanda/charts
Make a PR if you are able to.