fix: allow the header based session persistence not to have AbsoluteTimeout

[sanposhiho]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This PR scope out the header based session persistence from the validation AbsoluteTimeout must be specified when cookie lifetimeType is Permanent.

See #3214.

Which issue(s) this PR fixes:

Fixes #3214

Does this PR introduce a user-facing change?:

NONE

[sanposhiho]

/retest

[robscott]

Thanks @sanposhiho! Will defer to @gcs278 on this one, but this looks correct to me.

[robscott]

/assign @gcs278

[gauravkghildiyal]

Thanks!
/lgtm

[gcs278]

Good catch, I missed this with the initial revision, and thanks for the fix!
/lgtm

[robscott]

/approve
/cherry-pick release-1.1

[k8s-infra-cherrypick-robot]

@robscott: once the present PR merges, I will cherry-pick it on top of release-1.1 in a new PR and assign it to you.

In response to this:

/approve
/cherry-pick release-1.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: robscott, sanposhiho

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [robscott]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[sanposhiho]

Thanks for the review, everyone. What's the rule around /hold label in the project? Is it OK to just /unhold?

[robscott]

Thanks @sanposhiho!

We automatically add holds on any PR that modifies a GEP because we require at least two approvals on those. We've met that criteria here, so let's get this merged.

/hold cancel

[k8s-infra-cherrypick-robot]

@robscott: new pull request created: #3221

In response to this:

/approve
/cherry-pick release-1.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.