cleanup: use $OPENSHIFT_INSTALLER path

[honza]

The ocp directory doesn't always have the binary present. For example, the cleanup commands will fail when openshift-installer is built from git. The var is populate in common.sh and the same pattern is used in utils.sh when creating the cluster.

[openshift-ci]

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[elfosardo]

/retest

[elfosardo]

/lgtm

[openshift-ci]

@honza: 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/prow/e2e-metal-ipi-serial-ovn-ipv6	0a6b851	link	false	/test e2e-metal-ipi-serial-ovn-ipv6
ci/prow/e2e-metal-ipi-serial-ipv4	0a6b851	link	true	/test e2e-metal-ipi-serial-ipv4

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