nodelocaldns: have Prometheus collect metrics

[otterley]

Add the appropriate annotations to the nodelocaldns podspec so that Prometheus collects metrics from its coredns server, just like it already does for kube-dns.

/kind feature

Does this PR introduce a user-facing change?:

NONE

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[otterley]

/assign @MrHohn

[MrHohn]

/ok-to-test
/assign @prameshj

[prameshj]

/lgtm

[MrHohn]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MrHohn, otterley

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