[common]: make clusterIP independent of LoadBalancer

[HonoluluHenk]

What this PR does: This allows headless services (i.e.: setting ClusterIP: None for non-LoadBalancer types)

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Notes for Reviewer: Test compatibility with existing charts

Checklist:

• [ ] Pull Request title in format [chart]: Changed Something
• [ ] Updated documentation in the README.md.gotmpl file and executed helm-docs
• [ ] Chart Version bumped
• [ ] All commits are signed-off

[wthhub]

Thank you @HonoluluHenk for your contribution.

Please refer to the checklist in the PR description (version bump) and fulfill the checks in the separate tab. There are detailed instructions for fulfilling the DCO check.

[wthhub]

Closed with: https://github.com/bedag/helm-charts/pull/157