Add etcd-manager discoveryPollInterval option

[ottosulin]

This PR adds the discovery-poll-interval configuration option for etcd-manager, which was recently merged to etcd-manager.

[k8s-ci-robot]

Hi @ottosulin. Thanks for your PR.

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[hakman]

/ok-to-test
/cc @zetaab

[rifelpet]

/retest

[zetaab]

Thanks! Looks good

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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