Use MCONamespace constant in getPullSecret()

[mkenigs]

I originally has this as part of #3020 but it got lost since my PR merged before @jkyros's

[cgwalters]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cgwalters, mkenigs

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[openshift-bot]

/retest-required

Please review the full test history for this PR and help us cut down flakes.

[cgwalters]

e2e-gcp-op failures look like the same issues we've been having with timeouts.

[openshift-ci]

@mkenigs: 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-single-node	06d26ca	link	false	/test e2e-gcp-single-node
ci/prow/e2e-gcp-op-single-node	06d26ca	link	false	/test e2e-gcp-op-single-node

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