E2E tests need a way to get the Kubeflow deployment they should test on

[jlewi]

See: #95

E2E tests (such as E2E tests for our examples) need a way to request the endpoint for a Kubeflow deployment they can run.

We'd like some simply python scripts that hide the implementation details; e.g. we'd like a script that takes as input some query string that specifies constraints on the Kubeflow deployment (e.g. major version) and returns the endpoint of the cluster to use.

Under the hood this library might do something like use Boskos to request a matching cluster.

[jlewi]

/assign @gabrielwen