USHIFT-1828: add convenience keyword for running shell commands and testing results

[dhellmann]

No description provided.

[openshift-ci-robot]

@dhellmann: This pull request references USHIFT-1828 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.15.0" version, but no target version was set.

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[ggiguash]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dhellmann, ggiguash

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[openshift-ci]

@dhellmann: The following test 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/metal-periodic-test-arm	1afa03b	link	true	/test metal-periodic-test-arm

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