Add keep-alive config check test

[szombi]

What this PR does / why we need it:

Add test to check the keep-alive config.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Which issue/s this PR fixes

How Has This Been Tested?

make FOCUS="keep alive" kind-e2e-test

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

[k8s-ci-robot]

Hi @szombi. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

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/test-infra repository.

[aledbf]

/ok-to-test

[codecov-io]

Codecov Report

Merging #5101 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5101   +/-   ##
=======================================
  Coverage   58.68%   58.68%           
=======================================
  Files          88       88           
  Lines        6850     6850           
=======================================
  Hits         4020     4020           
  Misses       2390     2390           
  Partials      440      440

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[aledbf]

/retest

[aledbf]

/retest

[szombi]

/retest

[aledbf]

/lgtm
/approve

[aledbf]

@szombi thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, szombi

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 [aledbf]

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

[szombi]

/retest

[aledbf]

/retest