make livenessprobe consistent across manifests

[a7i]

Addresses 2 inconsistencies from #685 :

• livenessProbe.periodSeconds was not consistent across manifests (10 in one, 3 in others)
• charts/descheduler/templates/cronjob.yaml was missing livenessProbe but kubernetes/cronjob/cronjob.yaml had it

Also:

• Makes it possible to override via values.yaml for Helm

[k8s-ci-robot]

Hi @a7i. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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.

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[a7i]

/assign @ingvagabund

[damemi]

/ok-to-test

[damemi]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a7i, damemi

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[ingvagabund]

/lgtm