USHIFT-1401: rebase should only clean up files it creates

[dhellmann]

We use the _output directory for tools and test files, which should
not be deleted when running a rebase.

/assign @pmtk

[openshift-ci-robot]

@dhellmann: This pull request references USHIFT-1401 which is a valid jira issue.

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In response to this:

We use the _output directory for tools and test files, which should
not be deleted when running a rebase.

/assign @pmtk

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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/e2e-openshift-conformance-reduced-arm	3ba706c	link	false	/test e2e-openshift-conformance-reduced-arm

Full PR test history. Your PR dashboard.

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[pmtk]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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

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