[18.0-fr1] Ensure nodeSelector logic is consistent for all operators

[openshift-cherrypick-robot]

This is an automated cherry-pick of #266

/assign olliewalsh

[abays]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[olliewalsh]

/test placement-operator-build-deploy

[olliewalsh]

/override ci/prow/placement-operator-build-deploy ci/prow/placement-operator-build-deploy-kuttl
will create follow-up DNM PRs to test as there is a circular dependency with the openstack-operator patch

[openshift-ci]

@olliewalsh: Overrode contexts on behalf of olliewalsh: ci/prow/placement-operator-build-deploy, ci/prow/placement-operator-build-deploy-kuttl

In response to this:

/override ci/prow/placement-operator-build-deploy ci/prow/placement-operator-build-deploy-kuttl
will create follow-up DNM PRs to test as there is a circular dependency with the openstack-operator patch

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