steps/gcp-upi: Use coreos print-stream-json if available

[jstuever]

Part of openshift/enhancements#679

[petr-muller]

/uncc @droslean @petr-muller
/cc @patrickdillon

[openshift-ci]

@jstuever: 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/rehearse/openshift/installer/release-4.9/e2e-gcp-upi-xpn	4ef39ab	link	unknown	/test pj-rehearse
ci/rehearse/periodic-ci-openshift-verification-tests-master-ocp-4.9-e2e-gcp-cucushift-upi	4ef39ab	link	unknown	/test pj-rehearse
ci/prow/pj-rehearse	4ef39ab	link	false	/test pj-rehearse

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[jstuever]

/cc @staebler

[patrickdillon]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jstuever, patrickdillon

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Needs approval from an approver in each of these files:

• ci-operator/step-registry/upi/install/gcp/OWNERS [jstuever,patrickdillon]

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[openshift-bot]

/retest-required

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

[openshift-ci]

@jstuever: Updated the step-registry configmap in namespace ci at cluster app.ci using the following files:

• key upi-install-gcp-commands.sh using file ci-operator/step-registry/upi/install/gcp/upi-install-gcp-commands.sh

In response to this:

Part of openshift/enhancements#679

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