Basic k8s HTTP client

[coryodaniel]

Add a basic k8s HTTP client or URL generator for a "batteries included" experience.

I'm not sure that it should be as fully fledged as Kazan. I would rather defer to people to use that library if they needed a full implementation of a k8s client.

Rather, I'd like to include a small wrapper around HTTPoison or simple a URL/Path generator that:

• encapsulates ssl options and headers w/ K8s.Conf so once its loaded at runtime, it doesnt have to be passed around to each HTTP call (for HTTPoison)
• ship w/ a default list of namespaced vs clustered resources and make ad-hoc calls to /apis/apiextensions.k8s.io/v1beta1/customresourcedefinitions/{name} to determine the scope of CRDs
• Support misc operations (scale, status)

Support the following methods, accepting maps {"apiVersion": "apps/v1", "kind": "Deployment"} for mutations/statuses/reads and tuples {version, kind}|{version, kind, name} for reads/statuses

Write:

• Create
• Patch
• Replace
• Delete
• Delete Collection

Read:

• Read
• List
• List All Namespaces

Status:

• Patch Status
• Read Status
• Replace Status

Scale:

• Read Scale
• Replace Scale
• Patch Scale

[coryodaniel]

WIP @ https://github.com/coryodaniel/k8s_client