Cover zypper_patch by unit tests

[iliatsuprik]

Add more unit tests for ospatch/zypper_patch.go.

Coverage increased from 21.4% to 97.1%

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: iliatsuprik
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[burov]

/gcbrun

[google-oss-prow]

@iliatsuprik: 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	dbbfea9	link	true	/gotest

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