Improve AttachedRoutes conformance test

[levikobi]

What type of PR is this?

/kind test
/area conformance
What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #2058

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @levikobi. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[robscott]

Thanks @levikobi! This looks reasonable to me, will defer to someone else for approval though.

/lgtm
/ok-to-test

[mlavacca]

Apart from a minor nitpick, lgtm 👍

[mlavacca]

Thanks @levikobi!

/approve

I'll let someone else give it a final look and put lgtm.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: levikobi, mlavacca

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Needs approval from an approver in each of these files:

• conformance/OWNERS [mlavacca]

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[LiorLieberman]

Thanks @levikobi !
/lgtm