Cleaning up the kubeflow/pipeline repository.

[kubeflow-pipeline-bot]

This change is 

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[vicaire]

/lgtm

[vicaire]

/approved

[google-prow-robot]

@kubeflow-pipeline-bot: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
mlpipeline-build-image	57e70fc	link	/test mlpipeline-build-image
mlpipeline-presubmit-unit-test	57e70fc	link	/test mlpipeline-presubmit-unit-test

Full PR test history. Your PR dashboard.

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