Restore ability to set pod eviction timer

[holmesb]

Fixed issue #7112. Created new API Server vars that replace defunct Controller Manager one.

What type of PR is this?
/kind bug

What this PR does / why we need it:
Restores ability to set pod eviction timer

Which issue(s) this PR fixes:
Fixes #7112

Does this PR introduce a user-facing change?:
Only if they intend to change the pod eviction timer

[k8s-ci-robot]

Hi @holmesb. Thanks for your PR.

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[floryut]

/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, holmesb

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[holmesb]

Last push corrects the wrong values in kubernetes-reliability.md doc's Medium and Low Update sections. I had put "1m" should have been "60".

[EppO]

/lgtm