Pass multiple CIDRs to RKE2 server config

[simplysoft]

kind/feature

What this PR does / why we need it: All CIDRs should be passed to RKE2 server config.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): This fix is related to #337

Checklist:

• [x] squashed commits into logical changes
• [ ] includes documentation
• [ ] adds unit tests
• [ ] adds or updates e2e tests