Allow folks to have the kubeflow github repo over https + improve error message

[holdenk]

Allow folks to have the kubeflow github repo over https + improve error message -- we don't actually need testing.git for the remote

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This change is 

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[holdenk]

cc @pdmack since you're the one who told me about the auto-formatter :)

[googlebot]

CLAs look good, thanks!

[pdmack]

/ok-to-test

[pdmack]

/approve
/lgtm

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pdmack

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[holdenk]

/retest

[pdmack]

Ironically, all.jsonnet needs formatting.

[holdenk]

hahahah. Ok i'll reformat :)

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[holdenk]

Ran jsonnet format on all and it looks like it doesn't need any changes now, maybe master just was updated? /retest

[holdenk]

I'm not sure I understand the workflow failures... /retest?

[holdenk]

/retest

[k8s-ci-robot]

@holdenk: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
kubeflow-presubmit	1275eb2	link	/test kubeflow-presubmit

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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[jlewi]

Test failures should be unrelated to this PR. So I'll just merge this manually.

Thanks for the fix.

[holdenk]

Thanks @jlewi :)