Fix default backend port bug for ilb neg

[spencerhance]

Fixes a bug where we create a neg for the default backend with the wrong port

cc @freehan

/assign @MrHohn

[k8s-ci-robot]

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[spencerhance]

We'll need to cherry pick this to 1.8

[MrHohn]

/ok-to-test

[MrHohn]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MrHohn, spencerhance

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