Document about e2e how to test the specified modules

[chengjoey]

Which issue(s) this PR fixes:
Document about e2e how to test the specified modules
Reduce the time spent on local testing or e2e testing when submitting PRs

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: chengjoey
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[aojea]

/hold

Developers should use the ginkgo.focus and ginkgo.skip options to choose the tests they want to run

kubernetes-sigs/kind#1181 (comment)

[chengjoey]

/hold

Developers should use the ginkgo.focus and ginkgo.skip options to choose the tests they want to run

kubernetes-sigs/kind#1181 (comment)

thanks! @aojea