Defer the removal of labelAlphaNodeRoleExcludeBalancer to 1.18

[tedyu]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
labelAlphaNodeRoleExcludeBalancer is to be removed in 1.17

This PR delays the removal of the label handling to later release.

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[tedyu]

/test pull-kubernetes-e2e-gce-100-performance

[yastij]

/assign @andrewsykim

[yastij]

/lgtm

Can you also add a release-note for this ?

[andrewsykim]

Is this comment relevant kubernetes/enhancements#1144 (comment)? I feel that removing this after 1 release is pretty aggressive and if it's not that much work to support it longer term and not break users I think we should.

[andrewsykim]

IMO this something we can support longer with minimal effort and I think we should give users more than 1 release to make the necessary changes.

/assign @thockin

[yastij]

@andrewsykim - If we do have known users for this, we can definitely wait

[tedyu]

@andrewsykim @yastij
I have updated the PR.

Please take another look.

[tedyu]

@andrewsykim
Can you take another look ?

[thockin]

I often just say "after 1.17", meaning I don't have to update it again if we push it again :)

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[smarterclayton]

The KEP is updated with dates, once that is merged the email will go out to Kubernetes-dev with the described process (probably linked to a migration doc)