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

[openshift-cherrypick-robot]

This is an automated cherry-pick of #473

/assign olliewalsh

[olliewalsh]

/retest ci/prow/heat-operator-build-deploy

[openshift-ci]

@olliewalsh: The /retest command does not accept any targets.
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/test functional

/test heat-operator-build-deploy-kuttl

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/test precommit-check

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/test heat-operator-build-deploy

Use /test all to run all jobs.

In response to this:

/retest ci/prow/heat-operator-build-deploy

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[fao89]

/test heat-operator-build-deploy

[abays]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abays, openshift-cherrypick-robot

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[olliewalsh]

/override ci/prow/heat-operator-build-deploy ci/prow/heat-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/heat-operator-build-deploy, ci/prow/heat-operator-build-deploy-kuttl

In response to this:

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

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.