Fix find-binary to locate bazel e2e tests

[tallclair]

What this PR does / why we need it:

bazel build test/e2e/e2e.test places the output in bazel-bin/test/e2e/e2e.test, NOT in bazel-bin/test/e2e/linux_amd64_stripped/e2e.test as it does with other binaries. This change extends kube::util::find-binary-for-platform() to include the not platform-subpath in the search.

Special notes for your reviewer:

Insert: "I have no idea what I'm doing" meme.

Could this break anything?

Release note:

NONE

/sig testing

[ixdy]

/cc @BenTheElder

[BenTheElder]

Not exactly related to this PR, but it seems we check the non-platform specific locations first, i'm not sure how correct / useful this method is meant to be beyond "find something that maybe has that name" ...

https://github.com/kubernetes/kubernetes/pull/69548/files#diff-ef2873ebed657da627ed30f61dea2964R160

if that's the case, this seems fine to me

[ixdy]

@BenTheElder the ls -t line returns whichever location is most-recently updated.

[ixdy]

/lgtm
/hold

Do both hack/ginkgo-e2e.sh and cluster/kubectl.sh find the respective bazel-built binaries (e2e.test and kubectl) with this change?

I'd test it myself, but I'm on plane wifi at the moment.

[ixdy]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ixdy, tallclair

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[fejta]

Please pass tests

[ixdy]

those look like flakes?
/retest

[ixdy]

also it appears to do the right thing.
/hold cancel

[fejta-bot]

/retest
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[fejta-bot]

/retest
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