Replace shellout to kubectl with kubernetes_stateful_set

[RobinsonWM]

Today terraform-provider-kubernetes 1.4 was released with support for kubernetes_stateful_set, so the example can likely be updated to use the new resource instead of shelling out to kubectl.

The readme has this text at the bottom:

Q: Why didn't you use the Terraform Kubernetes provider to create the pods? There's this hacky template_file data source instead...
A: StatefulSets are not supported in Terraform yet. Should that change, we can avoid the shellout to kubectl.

[sethvargo]

Yea I saw it landed in master. Wasn't aware it was released yet though!

[sethvargo]

I got it working, but sadly affinity is not yet supported. I'm going to open the PR, but it will have to wait until that lands.

[bgeesaman]

@sethvargo There was a recent update that seems to indicate it landed?
Edit: That might be an erroneous statement.

[sethvargo]

It doesn't seem to be in a released version yet

[regner]

Just going through attempting to convert our fork of this over to using Terraform for the stateful set and have run into a few issues:

1. The service config option externalTrafficPolicy is not supported (r/service: Add external_traffic_policy to spec hashicorp/terraform-provider-kubernetes#59)
2. The affinity config option on the pod spec if not currently supported (Feature Request: Affinity hashicorp/terraform-provider-kubernetes#233)

[sethvargo]

Done!