Fixed: checking the correct value of use_localhost_as_kubeapi_loadbalancer

[stress-t]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Now use 127.0.0.1 as LB for kubeapi whenever use_localhost_as_kubeapi_loadbalancer is defined. This change will only allow 127.0.0.1 to be used when use_localhost_as_kubeapi_loadbalancer is true

Which issue(s) this PR fixes:
Fixes #7259

Special notes for your reviewer:

[k8s-ci-robot]

Hi @stress-t. Thanks for your PR.

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[floryut]

/ok-to-test

[oomichi]

/cc @champtar

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: champtar, floryut, stress-t

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[oomichi]

/lgtm