Add test for Fedora CoreOS before creating Docker service file

[danilo404]

fixes #6939

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change

/kind bug

/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

Fixes docker systemd file being created unnecessarily for fcos

Which issue(s) this PR fixes:

Fixes #6939

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Fixes a bug where the docker systemd service file was created for Fedora CoreOS

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I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[floryut]

@danilo404 now that #6910 is merged, could you please rebase master ? Thank you!

[floryut]

/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danilo404, floryut

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[oomichi]

/lgtm