shiftstack: Update OWNERS

[pierreprinetti]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

[openshift-ci]

@pierreprinetti: PR needs rebase.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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• OWNERS

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[openshift-ci]

@pierreprinetti: 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/govet	68a110e	link	true	/test govet
ci/prow/gofmt	68a110e	link	true	/test gofmt
ci/prow/e2e-openstack	68a110e	link	true	/test e2e-openstack
ci/prow/golint	68a110e	link	true	/test golint
ci/prow/images	68a110e	link	true	/test images
ci/prow/e2e-openstack-proxy	68a110e	link	false	/test e2e-openstack-proxy
ci/prow/unit	68a110e	link	true	/test unit

Full PR test history. Your PR dashboard.

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