[DO NOT MERGE] only set passwd if ssh keys are provided

[cheesesashimi]

This is a potential remedy for something uncovered in #4158. I only opened this PR in order to test this particular change in isolation and will close this PR once I know whether this change has any unintended consequences on our e2e test suites.

[cheesesashimi]

/test e2e-gcp-op
/test e2e-gcp-op-layering
/test e2e-gcp-op-sno

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cheesesashimi

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[cheesesashimi]

/test e2e-gcp-op-single-node

[cheesesashimi]

/test unit

[cheesesashimi]

/test e2e-gcp-op

[cheesesashimi]

This change did not cause any unintended side effects. Closing PR.

[cheesesashimi]

/test e2e-aws-ovn-fips-op

I'm running this as a baseline to establish whether TestFirstBootHasSSHKeys passes in a FIPS context.

[openshift-ci]

@cheesesashimi: 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-aws-ovn-fips-op	d5dba19	link	false	/test e2e-aws-ovn-fips-op

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