use new name for openshift-install ignition-configs sub-command

[staebler]

The openshift-install ignition-configs sub-command has been renamed to pre-cluster.

See openshift/installer#1119

[staebler]

/hold

Hold for openshift/installer#1119.

[vrutkovs]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: staebler, vrutkovs

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[openshift-ci-robot]

@staebler: PR needs rebase.

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[openshift-ci-robot]

@staebler: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/prow/generated-dashboards	1f88a71	link	/test generated-dashboards
ci/build-farm/build01-dry	1f88a71	link	/test build01-dry
ci/prow/prow-config	1f88a71	link	/test prow-config

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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