Generate pipeline and job python client as part of SDK

[IronPan]

So people can use python to CRUD pipeline or job, from for example notebook.

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This change is 

[IronPan]

fix #617

[IronPan]

/assign @qimingj @yebrahim

[gaoning777]

How about adding another function: upload_pipeline in the SDK to fix #617?
Wrapping the swagger interface helps to reduce friction for python SDK usage.

[qimingj]

Ditto @gaoning777. This is fine as the first step and we'll need a wrapper. We also need to add the packages in setup.py (https://github.com/kubeflow/pipelines/blob/master/sdk/python/setup.py)

[qimingj]

We can probably do the wrapper and add those to setup.py in a separate change.

[qimingj]

/lgtm

[IronPan]

/test kubeflow-pipeline-build-image

[IronPan]

/approve

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: IronPan

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• sdk/OWNERS [IronPan]

Approvers can indicate their approval by writing /approve in a comment
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[IronPan]

thanks i always forgot setup.py. I'll add it separately