Check ClusterRole resources in cluster in configuration phase

[ToxicWar]

I think this check will not only check if ClusterRole resources exist but also will check cluster connectivity too.
So, we can use this PR instead of the previous with "get nodes" logic.

Checking specific permissions may be on top of this (to create SA and RoleBinding resources).

Error writing data to k8s/config: Error making API request.

URL: PUT http://127.0.0.1:8200/v1/k8s/config
Code: 500. Errors:

* 1 error occurred:
	* Error: clusterroles.rbac.authorization.k8s.io "editor_role2" not found

Error writing data to k8s/config: Error making API request.

URL: PUT http://127.0.0.1:8200/v1/k8s/config
Code: 500. Errors:

* 1 error occurred:
	* Error: Unauthorized