Support DNS records for ingresses without rules

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If my ingress does not contain any rules but only a default backend no records are created. It would be great to implement an alternative way to create records if no rules are set.
For example the way mentioned in #142 can be a solution here. As a result we have a consistent way to handle services and ingresses.
We can just use both ways at the same time (use the template AND create records for every rule if one exists) or just fallback to the template method from #142 if no rules are defined.
Maybe a more sophisticated opt in/out configuration using annotations could be useful.

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Closed. Solved in #160 - confirmed working