Add client certificate and key to service monitor

[xueqzhan]

Added client certificates based on https://github.com/deads2k/openshift-enhancements/blob/master/enhancements/monitoring/client-cert-scraping.md

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: xueqzhan
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[openshift-ci]

@xueqzhan: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-gcp	57d13f5	link	true	/test e2e-gcp
ci/prow/verify	57d13f5	link	true	/test verify

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[perdasilva]

@xueqzhan I've fixed up your PR here: #368 and I'll close this one. Could you please review mine and make sure it's what you wanted?

[perdasilva]

/close

[openshift-ci]

@perdasilva: Closed this PR.

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/close

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