feat: add the ability to configure dnsPolicy on deployment (#733)

[JoshuaFurman]

• CHANGELOG.md updated
• Rebased/mergable
• Tests pass
• Sign CLA (if not already signed)

Testing was done with a local manual deployment using the new template on a kind cluster. I verified that the values were passed through to the deployment by inspecting the deployment with kubectl.

Thanks, this really helps when dealing with devices in a complex network topology.

[sfhl]

we also need this feature, but default values for dnsConfig:

...
executing "telegraf/templates/deployment.yaml" at <.Values.dnsConfig.nameservers>: nil pointer evaluating interface {}.nameservers
...

[JoshuaFurman]

Uh oh. I'll take a look once I get to my keyboard

[JoshuaFurman]

@sfhl sorry about that issue. I wasnt handling default values (no provided value) properly. I made the correct changes and validated the chart with a local deployment and with helm lint so it should be good for you to use now. Thanks for catching that.