Can't deploy stateful sets with Shipper properly

[parhamdoustdar]

This came up when a user tried to create a stateful set as part of his chart. The problem is that we inject labels into the template within a deployment object, but we don't do the same for Stateful Sets.

As a result, pods created with a Stateful Set are never matched against the selectors inside a Service.

[isutton]

I would suggest changing this from "bug" to "feature" since management of Stateful Sets were never tested nor considered.

[parhamdoustdar]

Good catch. I didn't realise "bug" was the default state.

[osdrv]

This task needs a generic example of a workload that could use stateful sets so Shipper can eventually advertise this model.