Fix kubeconfig_api_server_url for IPv6-only clusters

Version Control Information

Source branch: fix/api-server-url-ipv6 Target branch: devel

Commits:

* Fix kubeconfig_api_server_url for IPv6-only clusters

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Description

Fix on devel: !1984 (closed)

Backport to v9: !1985 (merged)

Backport to v10: !1986 (closed)

Closes: #

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Merge Prerequisites

• MR title (and description) are descriptive
• Code is readable and syntactically correct
• Code is understandable
• Documentation has been updated, if necessary
• Commit messages look good
• Release note file in RST format added in latest commit

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