Backwards compatibility support for RKE1 labels

[tomerleib]

RKE1 assigns the label node-role.kubernetes.io/controlplane to controlplane server, this allows master servers to work with service ELB.
RKE2 is using the node-role.kubernetes.io/master on the controlplane nodes and blocks service ELB from using those servers.

For future upgrade from RKE1 to RKE2, the labels should be persistent, otherwise it will break the compatibility with current installations.

[stale]

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[immanuelfodor]

Unstale

[brandond]

controlplane is incorrect; upstream uses control-plane which is what we will continue to do. The master role is being deprecated and will be dropped soon.

[stale]

This repository uses a bot to automatically label issues which have not had any activity (commit/comment/label) for 180 days. This helps us manage the community issues better. If the issue is still relevant, please add a comment to the issue so the bot can remove the label and we know it is still valid. If it is no longer relevant (or possibly fixed in the latest release), the bot will automatically close the issue in 14 days. Thank you for your contributions.