LabelBot Frontend should forward all traffic for the Kubeflow org to the pubsub topic

[jlewi]

Follow on to #70

We should update the microservice that is the front end for the label bot (handles GitHub webhooks) so that 100% of issues for repositories in the Kubeflow org are forwarded to the new label microservice backend that combines the universal model and repo specific models (see #70)

Here's a link to the code.
https://github.com/machine-learning-apps/Issue-Label-Bot/blob/536e8bf4928b03d522dd021c0464587747e90a87/flask_app/app.py#L145

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