[#2195] avoid using _ in cluster name

[finalspy]

Closes #2195

This is a quick'n'dirty fix.
Needs a review by someone able to see if this may have side effects on other things.

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[BenTheElder]

Thanks for the PR! Somehow I thought we'd done this already 😅

We should add a note to the comment about the further restrictions (being valid hostname characters).

Unfortunately AFAIK all PRs to the Kubernetes project do require the CLA, we won't be able to merge until that's fixed 😞

[BenTheElder]

fixed in #2226