Change ProviderConfig to ProviderSpec

[dlipovetsky]

From what I understand, the name ProviderConfig was chosen because it is "a serialized API object in a format owned by that provider, akin to the Component Config pattern" (emphasis mine). [0]

Unlike a Component Config, a ProviderConfig has a corresponding ProviderStatus. The name ProviderSpec follows from the Kubernetes API Status/Spec convention.

[0] https://github.com/kubernetes/community/blob/master/keps/sig-cluster-lifecycle/0003-cluster-api.md#overview

[davidewatson]

I think my rationale may be specious.

configuration := an arrangement of elements in a particular form, figure, or combination.
specification := an act of describing or identifying something precisely or of stating a precise requirement.

Since there is a ProviderStatus it seems reasonable to make the design pattern explicit by having a corresponding ProviderSpec.

¯_(ツ)_/¯

[dlipovetsky]

Working on a PR for this

[dlipovetsky]

I'm waiting for the move to CRDs before working on this change.

[roberthbailey]

Thanks. :)