Fixes subnet in e2e test command

[spencerhance]

The subnet field was added in #1867 but missed adding it to the CMD variable.

[k8s-ci-robot]

Hi @spencerhance. Thanks for your PR.

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[aojea]

/lgtm

[aojea]

/ok-to-test

[spencerhance]

/cc @swetharepakula

[aojea]

/approve

[swetharepakula]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, spencerhance, swetharepakula

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