Add URL context when HTTP request failed

[bsdnet]

Signed-off-by: Roy Yang royyang@google.com

What would you like to be added:

Add url string when HTTP request failed.

Why is this needed:
When try to debug the failure of https://testgrid.k8s.io/sig-node-containerd#containerd-e2e-gci-1.2
Log
"W0521 03:55:46.864] 2020/05/21 03:55:46 main.go:319: Something went wrong: failed to acquire k8s binaries: Unexpected HTTP status code: 404"

https://storage.googleapis.com/kubernetes-jenkins/logs/ci-containerd-e2e-gci-gce-1-2/1263317436568965131/build-log.txt

is not helpful without url string.

[k8s-ci-robot]

Hi @bsdnet. 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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[k8s-ci-robot]

@bsdnet: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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