Remove unnecessary generate pkg's unit tests

[shirmoran]

There is no need to test the output of the generate command in a unit test as we're already doing that in our e2e tests.

[SchSeba]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SchSeba, shirmoran

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[openshift-ci]

@shirmoran: 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/commatrix-e2e-tests-1of2	525682a	link	unknown	/test commatrix-e2e-tests-1of2

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[shirmoran]

/retest