Daneyon Hansen 3390bc3cbc Updates Kubeadm Master Endpoint for IPv6 ...

Previously, kubeadm would use <ip>:<port> to construct a master
endpoint. This works fine for IPv4 addresses, but not for IPv6.
IPv6 requires the ip to be encased in brackets when being joined
to a port with a colon.

This patch updates kubeadm to support wrapping a v6 address with
[] to form the master endpoint url. Since this functionality is
needed in multiple areas, a dedicated util function was created.

Fixes: https://github.com/kubernetes/kubernetes/issues/48227

2017-08-17 10:57:54 -07:00

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