Improve unit tests for ospatch/yum_update.go

[ganochenkodg]

github.com/GoogleCloudPlatform/osconfig/ospatch/yum_update.go:61: YumUpdateExcludes 0.0% -> 100.0%
github.com/GoogleCloudPlatform/osconfig/ospatch/yum_update.go:75: YumDryRun 0.0% -> 100.0%
github.com/GoogleCloudPlatform/osconfig/ospatch/yum_update.go:91: RunYumUpdate 73.1% -> 100.0%

[google-oss-prow]

Hi @ganochenkodg. Thanks for your PR.

I'm waiting for a GoogleCloudPlatform 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[iliatsuprik]

consider to move this function to common utiltests

[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]

@ganochenkodg: 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
prow/presubmit/gotest	f97d543	link	true	/gotest

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[google-oss-prow]

New changes are detected. LGTM label has been removed.