Webhook certs patch 1

[omniproc]

What this PR does / why we need it:

636dc73 unfortunately only did half the job. This is a extension to that pull to actually fix the problem with the very short lived default webhook certificate.

Testing done:
Verified certificate validity after re-deploying webhook with updated script.

Special notes for your reviewer:
This is only a workaround for the existing issue with the current openssl / bash script approach. Obviously this hole approach is unreliable and certificate management should be outsourced to certmanager instead.

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[divyenpatel]

/ok-to-test

[divyenpatel]

@omniproc can you fix linter issues?

[omniproc]

/retest

[divyenpatel]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: divyenpatel, omniproc

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