Add e2e test for connection timeout with l7-ilb

[spencerhance]

blocked by #852

/assign @freehan

[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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[rramkumar1]

/ok-to-test

[spencerhance]

/retest

[freehan]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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