Make fairing as a subpackage in kubeflow

[jinchihe]

What this PR does / why we need it:

Make fairing as a subpackage in kubeflow, see more in #234

After the PR, fairing will be a subpackage in kubeflow. and the changes are as following:

1. Created new kubeflow foler, and moved fairing and containerregistry to kubeflow.
2. Updated some imports to from kubeflow import fairing and import kubeflow.fairing.

For the kubeflow python sdk, user can install by

pip install kubeflow-fairing

Which issue(s) this PR fixes:
Fixes #234

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

Fairing is a subpackage in `kubeflow`.

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This change is 

[jinchihe]

Hello @jlewi @abhi-g @karthikv2k , the PR is ready for reviewing, thanks a lot!

[jinchihe]

/assign @jlewi
/assign @abhi-g

Could you please help to review? Thanks a lot!

[jlewi]

Would a user really do pip install kubeflow? Or does it depend on how we upload this to the pip repository?

[jlewi]

Reviewable status: 0 of 167 files reviewed, 1 unresolved discussion (waiting on @abhi-g, @jinchihe, and @karthikv2k)

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setup.py, line 7 at r1 (raw file):

setuptools.setup(
    name='kubeflow',

how about kubeflow-fairing so that its a sub package install?
See comment in #234 Do we need to create an Uber Kubeflow package right now?
If we do need an Uber package can we do that at release time by combining all the sub packages.

[jlewi]

One minor comment on my end; it looks like setup.py is naming the package to "kubeflow" per my comments in #234 I prefer to keep the pip package named such that it reflects the fact that fairing is just one subpackage.

Could we change it to something like

pip install kubeflow-fairing

[jinchihe]

Hello @jlewi @abhi-g

Addressed your comments, updated the PR using pkgutil-style namespace packages which supports Python 2. See more discussion with @jlewi in #234 For now the Fairing is kubefloe subpacakge, and user can install kubeflow-fairing by:

pip install kubeflow-fairing

Ready for checking in, please view. thanks!

[jlewi]

Whoo Hooo!
/lgtm
/approve
/hold

@jinchihe Can you open issues to update the examples and docs? They should probably be P0 and filed under project 0.7.

I think we should probably get the xgboost_synthetic example updated at a minimum.

You can remove the hold. I just wanted you to see this comment and file the issues. Thanks

[jinchihe]

@jlewi Yes, already logged ticket in examples kubeflow/examples#636 and doc kubeflow/website#1146, and assigned to me, will update very soon.

/hold cancel

[jinchihe]

/approve

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