Generate NodePort address listings from PersistentVolume reservations

[nightkr]

Description

Fixes #220, fixes #229.

This should make stable address listings.. stabler, since the PV "represents" the lifetime of the reservation.

Definition of Done Checklist

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1. Changes are OpenShift compatible
2. Helm chart can be installed and deployed operator works
3. Integration tests passed (for non trivial changes)
4. Changes need to be "offline" compatible

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1. Code contains useful comments
2. Code contains useful logging statements
3. (Integration-)Test cases added
4. Documentation added or updated. Follows the style guide.
5. Changelog updated
6. Cargo.toml only contains references to git tags (not specific commits or branches)

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1. Feature Tracker has been updated
2. Proper release label has been added
3. Roadmap has been updated

[sbernauer]

Only minor style comments

[sbernauer]

Thanks!