Support dns configurations for scheduler and webserver

[messerzen]

I think it would be helpful to allow dns configurations on helm chart like dnsConfig and dnsPolicy. For now, I need to set some custom configurations for dns and I'm not able to do this directly in helm chart. To solve this problem, I'm generating the yaml files using helm template and deploying theses files. So, it would be helpful to set in helm chart, like this

dnsPolicy: "ClusterFirstWithHostNet"
      dnsConfig:
        nameservers:
        - XXX.XXX.X.XXX