Add support for Python first-class providers

[swgillespie]

Adds support for referring to the Kubernetes provider in a first-class
manner in Python. This is accomplished using a similar method to Node -
the provider is explicitly projected as a resource and users are free to
instantiate it at-will and use it to create other Kubernetes resources.

This commit also adds a smoke test for the feature.

(Finally) fixes pulumi/pulumi#1713.

[swgillespie]

I haven't hooked up the test to the test harness yet - I suspect that it'll fail since it requires a new release of pulumi to function correctly.

[hausdorff]

@swgillespie you seem to be correct about the failure, what do we need to get this up and running? Wait for a release? (I know embarrassingly ~nothing about pip.)

[swgillespie]

you seem to be correct about the failure, what do we need to get this up and running? Wait for a release? (I know embarrassingly ~nothing about pip.)

On Friday we shipped a release of the pulumi package with support for first-class providers, so I think all that needs to happen here is to bump our pulumi reference in the pulumi-kubernetes package. I'll give that a try.

[swgillespie]

Looks like the istio test failed?

[                          step1 ] Diagnostics:
[                          step1 ]   gcp:container:Cluster (test-ci-istio):
[                          step1 ]     error: Plan apply failed: 1 error occurred:
[                          step1 ]     
[                          step1 ]     * creating urn:pulumi:p-it-travis-job-step1-f366dabc::istio::gcp:container/cluster:Cluster::test-ci-istio: Invalid address to set: []string{"cluster_autoscaling"}

[lblackstone]

Looks like the istio test failed?

[                          step1 ] Diagnostics:
[                          step1 ]   gcp:container:Cluster (test-ci-istio):
[                          step1 ]     error: Plan apply failed: 1 error occurred:
[                          step1 ]     
[                          step1 ]     * creating urn:pulumi:p-it-travis-job-step1-f366dabc::istio::gcp:container/cluster:Cluster::test-ci-istio: Invalid address to set: []string{"cluster_autoscaling"}

#351 (comment)

[swgillespie]

nice!

[hausdorff]

Don't know much about pulumi.ProviderResource, so this approval comes with a grain of salt. :)

[hausdorff]

@swgillespie re-ran your tests, this is a Python-related error: https://travis-ci.com/pulumi/pulumi-kubernetes/builds/97289084#L8441

[swgillespie]

I'm not sure what the deal is with the Python issue, but it didn't repro when I re-ran the tests again... most likely something went wrong here during the installation step, since the crash isn't in our code at all.

Is this ok to merge?