Set poll period of metrics server nanny to 30s

[olagacek]

Set poll period of changes from k8s api in metrics server nanny to 30s.
This will enable faster scaling of metrics server

What type of PR is this?

/kind feature

What this PR does / why we need it:

Decreases poll period of changes from k8s api in metrics server nanny from 5 minutes to 30s. It allows faster scaling of metrics server

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Metrics server nanny has now poll period set to 30s (previously 5 minutes) to allow faster scaling of metrics server.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Hi @olagacek. Thanks for your PR.

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[logicalhan]

/assign @serathius
/triage accepted
/ok-to-test

[serathius]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: olagacek, serathius

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