Improve distribution tests in conformance for HTTPRouteWeight

[carsontham]

What type of PR is this?

/area conformance-test

What this PR does / why we need it:
Adding entropy to distribution tests for HTTPRouteWeight as per comment #3855 (review)

This is done by reusing the entropy method to create jitter in the requests.

Which issue(s) this PR fixes:

Fixes #3832

Does this PR introduce a user-facing change?:

Improve conformance distribution tests for HTTPRouteWeight

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: carsontham
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[k8s-ci-robot]

Hi @carsontham. 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[carsontham]

hey @LiorLieberman! created a follow-up PR for HTTPRouteWeight as per discussed previously. Please take a look, thanks!

[mikemorris]

/ok-to-test