add boilerplate header to fix boilerplate test

[yiyang5055]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

/kind cleanup

What this PR does / why we need it:

#244 include fix default boilerplate path, and make test-boilerplate will failed

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

None

Does this PR introduce a user-facing change?:

None

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @yiyang5055. Thanks for your PR.

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[yiyang5055]

/assign @saad-ali

[yiyang5055]

/assign @pohly

[pohly]

/ok-to-test
/lgtm

[xing-yang]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xing-yang, yiyang5055

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