NO-ISSUE: Cleanup

[pawanpinjarkar]

Cleanup the $REGISTRY_CREDS file created in the 02_configure_host.sh file when cleaning up.

If not cleaned properly, there could be possible errors such as #1753

[pawanpinjarkar]

/cc @andfasano @bfournie @rwsu

[openshift-ci]

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[openshift-ci]

@pawanpinjarkar: 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	f8e3b2f	link	false	/test e2e-metal-ipi-serial-ovn-ipv6
ci/prow/e2e-metal-ipi-serial-ipv4-1of2	f8e3b2f	link	true	/test e2e-metal-ipi-serial-ipv4-1of2

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