Cherry pick #900 into release-1.7

[spencerhance]

#900 [enqueue default backend for NEG processing]

[k8s-ci-robot]

Hi @spencerhance. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[spencerhance]

/assign @freehan

[freehan]

/ok-to-test

[freehan]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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