feat: add parent/k8sState hostname value

[ilyam8]

Fixes: #445

[ilyam8]

I'm not sure we need to set deployment.spec.template.spec.hostname as well 🤷‍♂️ Not doing that in this PR.

[jamesharr]

I'm not sure we need to set deployment.spec.template.spec.hostname as well 🤷‍♂️ Not doing that in this PR.

I think you made the right call. I'd advise against setting deployment.spec.template.spec.hostname unless a compelling need emerges.

1. Since you're setting the hostname in the netdata config file, it achieves the desired behavior in Add ability to set hostname for netdata-parent and netdata-k8s-state kubernetes pods #445 and ignores the container's hostname
2. In my k8s experience, it's exceedingly uncommon to set the container's hostname. Doing so might be confusing when troubleshooting something. When troubleshooting, I typically expect the hostname to be the container's name if I shell in.

Thanks for the quick patch, I appreciate it.