use dl.k8s.io instead of hardcoded GCS URIs

[spiffxp]

The only time a kubernetes GCS bucket name should be showing up in a
hardcoded URI is if gsutil is being used (e.g. gsutil cp gs://foo/bar .)

Otherwise, for tools like curl or wget, dl.k8s.io is much nicer for us
as a project, since we can transparently change where that redirects to
without having to change code everywhere

These changes will mean no changes will be necessary to accommodate a
gs://kubernetes-release -> gs://k8s-release migration equivalent of
the CI migration we're going through right now

These changes also address the gs://kubernetes-release-dev references
currently used by this repo (ref:
kubernetes/k8s.io#2318)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: spiffxp
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[spiffxp]

@deepak-vij your tests appear to be broken, do you have time to look into that? I'm going to manually merge if this goes a few days with no comment

[k8s-ci-robot]

@spiffxp: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Rerun command
pull-poseidon-bazel	6be0340	link	/test pull-poseidon-bazel
pull-poseidon-verify	6be0340	link	/test pull-poseidon-verify
ci-poseidon-e2e-gce	6be0340	link	/test ci-poseidon-e2e-gce

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[deepak-vij]

Hi @spiffxp, apologize for the inconvenience. Please go ahead and manually merge it at this time as you suggested earlier. We can also retire this project. Is this something I need to do that you folks can do it yourself. Please let me know. Thanks.

[spiffxp]

Use my admin privileges on this repo to merge this as requested