Fix typo in component name of prometheus-to-sd config.

[loburm]

Fixes GoogleCloudPlatform/k8s-stackdriver#70

Fix a typo in prometheus-to-sd configuration, that drops some stackdriver metrics.

[loburm]

/test pull-kubernetes-unit
/test pull-kubernetes-e2e-gke-gci

[loburm]

/test pull-kubernetes-verify

[k8s-ci-robot]

@loburm: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-kubernetes-e2e-gke-gci	3d7a694	link	/test pull-kubernetes-e2e-gke-gci

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[crassirostris]

/lgtm
/approve no-issue

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: crassirostris, loburm

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[k8s-github-robot]

[MILESTONENOTIFIER] Milestone Pull Request Current

@crassirostris @loburm @piosz

Note: This pull request is marked as priority/critical-urgent, and must be updated every 1 day during code freeze.

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ETA: DD/MM/YYYY
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[k8s-github-robot]

Automatic merge from submit-queue (batch tested with PRs 56344, 56473). If you want to cherry-pick this change to another branch, please follow the instructions here.