ThirdParty resources support

[sebgoa]

If we create a 3rd party resource, it creates a new API group.

I am not sure how kubectl implements it, but we need to have an example on how to do this with this client.

For example, say I create a 3rd party resource called snake. In kubectl I can do:

kubectl get snakes

It dynamically learns of new resources in new API groups.

[mbohlool]

A possible solution is to have k8sutil.Resource(name=...) class that supports k8s resources such as pod, service, etc. as well as third party resources.

[mbohlool]

dup of #201. closing this one.