Add unit tests for policies/recipes/steps_linux.go

[ganochenkodg]

github.com/GoogleCloudPlatform/osconfig/policies/recipes/steps_linux.go:24: mkCharDevice 100.0%
github.com/GoogleCloudPlatform/osconfig/policies/recipes/steps_linux.go:28: mkBlockDevice 100.0%
github.com/GoogleCloudPlatform/osconfig/policies/recipes/steps_linux.go:32: mkFifo 100.0%

[google-oss-prow]

Hi @ganochenkodg. Thanks for your PR.

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[iliatsuprik]

that is used in each test, so can be extracted into a function

[ganochenkodg]

done

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ganochenkodg, iliatsuprik
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[google-oss-prow]

New changes are detected. LGTM label has been removed.