Extend the timeout for CDN tests from 15 min to 30 min

[ruixiansong]

/assign @swetharepakula

[k8s-ci-robot]

Hi @ruixiansong. Thanks for your PR.

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[sawsa307]

/ok-to-test

[swetharepakula]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ruixiansong, swetharepakula

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[k8s-ci-robot]

New changes are detected. LGTM label has been removed.